Position detection device

Abstract

To reduce the influence of a first target on the output value of a receiving coil for detecting the position of a second target in a position detection device that detects each of the position of the first target and the position of the second target.SOLUTION: A first one-side target 22 moves back and forth in a member circumferential direction Dc. The first one-side target 22 moves back and forth within an operating range W1a where the first one-side target 22 does not overlap the other side of a member axial direction Da relative to a second one-side receiving area 303 and a second other-side receiving area 304. Therefore, this makes it possible to avoid interference of the first one-side target 22 with magnetic flux passing through third and fourth receiving coils 40, 42, 41, 43 for detecting the position of second targets 24, 25. Thus, it is possible to reduce the influence of the first one-side target 22 on the respective output values of the third and fourth receiving coils 40, 42, 41, 43.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a position detection device.

Background Art

[0002] As this type of position detection device, for example, an angular position sensor described in Patent Document 1 has been conventionally known. The angular position sensor described in Patent Document 1 detects the rotational position of a detection object that rotates around a rotation axis by using electromagnetic induction. For this purpose, the angular position sensor of Patent Document 1 includes two sets of coil combinations each composed of a transmission coil that generates an alternating magnetic field and two reception coils arranged inside the transmission coil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, the detection object whose rotational position is detected by the angular position sensor rotates one or more times around the rotation axis. However, depending on the application, it is also assumed that the detection object reciprocates within a limited operating range. In order to achieve redundancy in such a case, the inventors considered the following configuration. That is, a first target and a second target are provided on the detection object, and the inventors considered a configuration in which the position detection device includes a reception coil for detecting the position of the first target and a reception coil for detecting the position of the second target, respectively.

[0005] However, with the configuration envisioned by the inventors, there is a concern that one of the first or second targets may affect the output value of the receiving coil used for position detection of the other target. The inventors found this to be the case after detailed investigation.

[0006] In view of the above, the present invention aims to reduce the influence of the first target on the output value of the receiving coil for detecting the position of the second target in a position detection device that detects the position of a first target and the position of a second target, respectively. [Means for solving the problem]

[0007] To achieve the above objective, the position detection device described in claim 1 is: A first target (22, 23) moves back and forth in a predetermined direction of movement (Dc), A second target (24, 25) moves back and forth in the direction of movement along with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) that receive induced currents due to electromagnetic induction caused by energizing the first transmitting coil and output detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) that receive induced currents due to electromagnetic induction caused by energizing the second transmitting coil and output detection signals corresponding to the position of the second target, and a substrate (30) that faces the first target and the second target, with the direction intersecting the above-mentioned direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target. The first receiving region (301, 302) occupied by the first and second receiving coils within the substrate, and the second receiving region (303, 304) occupied by the third and fourth receiving coils within the substrate, are arranged side by side in the direction of movement described above. The first target moves back and forth within an operating range (W1a, W1b) relative to the second receiving area such that the first target does not overlap with the other side opposite to one side in the normal direction.death, The first target and the second target each constitute a part of a rotating member (16, 18, 20) that rotates around an axis (CL) with the above normal direction as the axial direction. The above direction of movement is the circumferential direction (Dc) of the axis, Two first targets are provided, and one of the two first targets (22) is positioned on the opposite side of the axis from the other first target (23). Two receiving coil groups (301a, 302a) are also provided, each consisting of a first receiving coil and a second receiving coil. One of these receiving coil groups (301a) is positioned on the opposite side of the axis from the other receiving coil group (302a).

[0008] In this way, interference from the first target with the magnetic flux passing through the third and fourth receiving coils for detecting the position of the second target can be avoided. Therefore, it is possible to reduce the influence of the first target on the output values ​​(i.e., detection signals) of the third and fourth receiving coils.

[0009] In addition, in some cases, each element in the application documents may be denoted by a reference numeral in parentheses. In this case, the reference numeral merely indicates one example of the correspondence between the element and the specific configuration described in the embodiments described later. Therefore, the present invention is not limited in any way by the notation of reference numerals. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing the position detection device in the first embodiment as viewed along the axis direction of the member, illustrating the general configuration of the position detection device. [Figure 2] This is a cross-sectional view showing the II-II section of Figure 1, which is a longitudinal cross-sectional view of the position detection device. [Figure 3] This is a cross-sectional view showing the III-III section of Figure 1, and is a longitudinal cross-sectional view showing the position detection device in a different orientation than that of Figure 2. [Figure 4] This is a plan view showing the rotating member of the position detection device as a single unit in the first embodiment. [Figure 5] In the first embodiment, the circuit board of the position detection device is shown as a standalone unit, and the individual coils within that circuit board are schematically shown. [Figure 6] This is a view from the direction of arrow VI in Figure 5, schematically showing each transmitting coil within the substrate. [Figure 7]A schematic diagram corresponding to FIG. 5, in which the receiving coil shown in FIG. 5 is replaced with the receiving area formed by the receiving coil and displayed. [Figure 8] A block diagram of the position detection device in the first embodiment. [Figure 9] In the first embodiment, a diagram exemplifying the waveforms of the first voltage value output from the first receiving coil and the second voltage value output from the second receiving coil, respectively. [Figure 10] In the second embodiment, a diagram showing the substrate of the position detection device alone and schematically showing each coil in the substrate, which is a diagram corresponding to FIG. 5. [Figure 11] In the third embodiment, a diagram showing the substrate of the position detection device alone and schematically showing each coil in the substrate, which is a diagram corresponding to FIG. 5. [Figure 12] In the fourth embodiment, a diagram showing the substrate of the position detection device alone and schematically showing each coil in the substrate, which is a diagram corresponding to FIG. 5. [Figure 13] A block diagram of the position detection device in the fifth embodiment, which is a diagram corresponding to FIG. 8. [Figure 14] In the fifth embodiment, a flowchart showing the control process executed by the first failure detection unit. [Figure 15] In the first comparative example compared with the fifth embodiment, a diagram showing the relationship between each of the first sensor output and the second sensor output and the rotation angle of the rotating member. [Figure 16] A schematic diagram showing the position detection device in the sixth embodiment in a direction view along the member axis direction and showing the schematic configuration of the position detection device, which is a diagram corresponding to FIG. 1. [Figure 17] A cross-sectional view showing the XVII-XVII cross-section of FIG. 16, which is a diagram corresponding to FIG. 2. [Figure 18] A cross-sectional view showing the XVIII-XVIII cross-section of FIG. 16, which is a diagram corresponding to FIG. 3.

Embodiments for Carrying Out the Invention

[0011] The embodiments will be described below with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings.

[0012] (First Embodiment) In this embodiment, an example is described in which the position detection device 1 is used to detect the rotational position of the brake pedal or accelerator pedal of a vehicle's pedal system. In the following description, the brake pedal or accelerator pedal may sometimes be simply referred to as the pedal.

[0013] As shown in Figures 1 to 3, the position detection device 1 of this embodiment comprises a rotating member 20 and a substrate 30. The rotation axis CL shown in Figures 1 to 3 is the rotation axis 70 of the pedal and the rotation center of the rotating member 20. In the description of this embodiment, the axial direction Da of the rotation axis CL is also referred to as the member axial direction Da, the radial direction Dr of the rotation axis CL is also referred to as the member radial direction Dr, and the circumferential direction Dc of the rotation axis CL is also referred to as the member circumferential direction Dc. These directions Da, Dr, and Dc are intersecting directions, or more precisely, perpendicular directions. Figure 1 is a cross-sectional view showing section II of Figure 2.

[0014] The rotating member 20 is made of metal and is formed in the shape of a flat plate with thickness in the axial direction Da of the member. As shown in Figures 1 to 4, the rotating member 20 is connected to the rotation axis 70 of the pedal in a way that prevents relative rotation. For example, the rotating member 20 may be prevented from rotating relative to the rotation axis 70 by using a locking key member, or it may be prevented from rotating relative to the rotation axis 70 by welding it.

[0015] The rotating member 20 is supported by the non-rotating member via a rotating shaft 70 so as to be able to rotate around a predetermined rotation axis CL, and rotates integrally with the pedal and the rotating shaft 70. Therefore, the rotation position of the pedal can be detected by detecting the rotation position of the rotating member 20. In other words, the rotation position of the rotating member 20 is also the rotation position of the pedal, and is also the rotation position of the rotating shaft 70 as the object to be detected.

[0016] Furthermore, since the rotating member 20 is connected to the rotation axis 70 of the pedal, it does not rotate once around the rotation axis CL, but rather reciprocates within a predetermined angular range around the rotation axis CL in accordance with the pedal pressing operation. In Figure 1, a portion of the outer shape of each target 22-25 of the rotating member 20 at the end position during this reciprocating motion is illustrated by a dashed line.

[0017] The rotating member 20 has a connecting portion 21, two first targets 22 and 23, and two second targets 24 and 25. That is, the two first targets 22 and 23 and the two second targets 24 and 25 included in the rotating member 20 rotate together around the rotation axis CL. Then, as the pedal is pressed, the two first targets 22 and 23 and the two second targets 24 and 25 both reciprocate in the circumferential direction Dc of the member. In this embodiment, the circumferential direction Dc of the member corresponds to a predetermined direction of movement of this disclosure.

[0018] For example, the rotating member 20 is configured as a single component including its connecting portion 21, two first targets 22 and 23, and two second targets 24 and 25. For example, the rotating member 20 is formed in a flat plate shape with a uniform thickness in the member axial direction Da, and therefore the thickness of the four targets 22 to 25 in the member axial direction Da is the same size. In this description of the embodiment, the two first targets 22 and 23 and the two second targets 24 and 25 may be collectively referred to as targets 22 to 25.

[0019] The connecting portion 21 is positioned in the central part of the rotating member 20 and has an annular shape centered on the rotation axis CL. Inside the connecting portion 21, an insertion hole 21a is formed, which penetrates the connecting portion 21 in the member axial direction Da, and the rotating shaft 70 is fitted into the insertion hole 21a such that it cannot rotate relative to the connecting portion 21. In other words, the rotating member 20 is connected to the rotating shaft 70 at this connecting portion 21.

[0020] The two first targets 22 and 23 are each formed to protrude outward from the connecting portion 21 in the radial direction Dr of the member, and the two second targets 24 and 25 are also each formed to protrude outward from the connecting portion 21 in the radial direction Dr of the member.

[0021] One of the two first targets 22 and 23, the first one-sided target 22, is positioned on the opposite side of the rotation axis CL from the other of the two first targets 22 and 23, the first other-sided target 23. Similarly, one of the two second targets 24 and 25, the second one-sided target 24, is positioned on the opposite side of the rotation axis CL from the other of the two second targets 24 and 25, the second other-sided target 25.

[0022] In detail, the four targets 22-25 are arranged in the order of first one-sided target 22, second one-sided target 24, first other-sided target 23, and second other-sided target 25, with equal spacing between them and at equal pitches (specifically, 90-degree pitches) along one side of the member's circumferential direction Dc. For example, when viewed along the member's axial direction Da, the four targets 22-25 as a whole are arranged point-symmetrically with respect to the rotation axis CL.

[0023] The first one-sided target 22 has a facing surface 22a formed on one side in the member axis direction Da and facing the other surface 30b of the substrate 30, and the first other-sided target 23 also has a facing surface 23a formed on one side in the member axis direction Da and facing the other surface 30b of the substrate 30. The second one-sided target 24 also has a facing surface 24a formed on one side in the member axis direction Da and facing the other surface 30b of the substrate 30, and the second other-sided target 25 also has a facing surface 25a formed on one side in the member axis direction Da and facing the other surface 30b of the substrate 30. These facing surfaces 22a to 25a are formed parallel to the other surface 30b of the substrate 30.

[0024] The first one-sided target 22 has one end edge 221 provided on one side in the member circumferential direction Dc and another end edge 222 provided on the other side in the member circumferential direction Dc. The first one-sided target 22 has a fan shape that widens in the member circumferential direction Dc as it moves outward from the member radial direction Dr. Therefore, the one end edge 221 and the other end edge 222 of the first one-sided target 22 each extend in a straight line along the member radial direction Dr when viewed in the direction along the member axial direction Da. That is, the one end edge 221 and the other end edge 222 of the first one-sided target 22 each extend perpendicular to the direction of movement of the first one-sided target 22, which is the member circumferential direction Dc.

[0025] Furthermore, the first other-side target 23, the second one-side target 24, and the second other-side target 25 also have a fan-shaped form similar to the first one-side target 22. In this embodiment, all four targets 22 to 25 have the same shape.

[0026] Therefore, one end edge 231 of the first other-side target 23, provided on one side in the circumferential direction Dc of the member, and the other end edge 232, provided on the other side in the circumferential direction Dc of the member, both extend in a straight line along the radial direction Dr of the member when viewed in the direction along the axial direction Da of the member. Similarly, one end edge 241 of the second one-side target 24, provided on one side in the circumferential direction Dc of the member, and the other end edge 242, provided on the other side in the circumferential direction Dc of the member, both extend in a straight line along the radial direction Dr of the member when viewed in the direction along the axial direction Da of the member. Furthermore, one end edge 251 of the second other-side target 25, provided on one side in the circumferential direction Dc of the member, and the other end edge 252, provided on the other side in the circumferential direction Dc of the member, both extend in a straight line along the radial direction Dr of the member when viewed in the direction along the axial direction Da of the member.

[0027] In this embodiment, as described above, all four targets 22 to 25 have the same shape and rotate as a single unit, so the operating ranges W1a, W1b, W2a, and W2b of each target 22 to 25 are the same length in the circumferential direction Dc of the member.

[0028] The operating range W1a of the first one-sided target 22 is the maximum range in the circumferential direction Dc of the member that the first one-sided target 22 extends to as it reciprocates, and the first one-sided target 22 reciprocates in the circumferential direction Dc of the member within its operating range W1a. The operating range W1b of the first other-sided target 23 is the maximum range in the circumferential direction Dc of the member that the first other-sided target 23 extends to as it reciprocates, and the first other-sided target 23 reciprocates in the circumferential direction Dc of the member within its operating range W1b. The operating range W2a of the second one-sided target 24 is the maximum range in the circumferential direction Dc of the member that the second one-sided target 24 extends to as it reciprocates, and the second one-sided target 24 reciprocates in the circumferential direction Dc of the member within its operating range W2a. Furthermore, the operating range W2b of the second other-side target 25 is the maximum range in the circumferential direction Dc of the member that the second other-side target 25 extends to as it reciprocates, and the second other-side target 25 reciprocates in the circumferential direction Dc of the member within its operating range W2b.

[0029] As shown in Figures 1 to 3 and Figure 5, the substrate 30 is a multilayer printed circuit board with wiring patterns formed on it and electrical components (not shown) mounted on it. The substrate 30 has a planar surface 30a and another surface 30b that are perpendicular to the member axis direction Da. That is, the normal direction of the substrate 30 coincides with the member axis direction Da. The surface 30a of the substrate 30 is located on one side of the substrate 30 in the direction of the member axis direction Da, and the other surface 30b of the substrate 30 is located on the other side of the substrate 30, opposite to the side in the direction of the member axis direction Da.

[0030] The substrate 30 is a non-rotating component that does not rotate relative to the vehicle body or the like. Therefore, the rotating component 20 rotates relative to the substrate 30.

[0031] The substrate 30 is positioned on one side of the member axis direction Da relative to the four targets 22-25. The other side 30b of the substrate 30 faces each of the opposing surfaces 22a-25a of the four targets 22-25 with an axial gap AG in the member axis direction Da. This axial gap AG is the same size in all cases between the substrate 30 and each of the four targets 22-25.

[0032] Furthermore, the substrate 30 has a disc shape centered on the rotation axis CL, and a through hole 30c is formed in the center of the substrate 30, penetrating the substrate 30 in the member axis direction Da. The rotation shaft 70 is inserted through this through hole 30c.

[0033] As shown in Figures 5 and 6, the substrate 30 has a first transmitting coil 31 and a second transmitting coil 32 formed as wiring patterns. The substrate 30 also has two first receiving coils 34 and 36, two second receiving coils 35 and 37, two third receiving coils 40 and 42, and two fourth receiving coils 41 and 43, all formed as wiring patterns. In other words, all the transmitting coils 31 and 32 and all the receiving coils 34-37 and 40-43 provided in the position detection device 1 are formed on a single substrate 30.

[0034] Each of the coils 31, 32, 34-37, and 40-43 on the circuit board 30 is connected to the signal processing units 47 and 48 (see Figure 8), which are composed of ICs and other components mounted on the circuit board 30, via connection wiring patterns not shown. In Figures 5 and 6, each of the coils 31, 32, 34-37, and 40-43 is shown in a simplified manner for clarity, and this is also the case in the later diagrams that show each of the coils 31, 32, 34-37, and 40-43.

[0035] The first and second transmitting coils 31 and 32 are formed to overlap each other when viewed along the member axis direction Da, but are offset in the thickness direction of the substrate 30, i.e., in the member axis direction Da. For example, the first transmitting coil 31 is positioned away from the second transmitting coil 32 on one side in the member axis direction Da.

[0036] The first and second transmitting coils 31 and 32 are each wound one or more times to form a ring shape. The first and second transmitting coils 31 and 32 are each formed to surround all the receiving coils 34-37 and 40-43 of the substrate 30 when viewed along the member axis Da. In other words, when viewed along the member axis Da, all the receiving coils 34-37 and 40-43 are located inside the first transmitting coil 31 and inside the second transmitting coil 32.

[0037] Therefore, when an alternating current flows through the first transmitting coil 31, electromagnetic induction caused by the energization of the first transmitting coil 31 causes an induced current to flow through all the receiving coils 34-37 and 40-43. Similarly, when an alternating current flows through the second transmitting coil 32, electromagnetic induction caused by the energization of the second transmitting coil 32 causes an induced current to flow through all the receiving coils 34-37 and 40-43. In order to avoid the magnetic fields generated by the first transmitting coil 31 and the second transmitting coil 32 canceling each other out, for example, alternating currents with the same phase and frequency flow through the first transmitting coil 31 and the second transmitting coil 32.

[0038] The first one-sided receiving coil 34, one of the two first receiving coils 34 and 36, and the second one-sided receiving coil 35, one of the two second receiving coils 35 and 37, are coils for detecting the position of the first one-sided target 22 in the circumferential direction Dc of the member. In other words, the first one-sided receiving coil 34 and the second one-sided receiving coil 35 each generate an induced electromotive force corresponding to the position of the first one-sided target 22.

[0039] Furthermore, the first other-side receiving coil 36, which is the other of the two first receiving coils 34 and 36, and the second other-side receiving coil 37, which is the other of the two second receiving coils 35 and 37, are coils for detecting the position of the first other-side target 23 in the circumferential direction Dc of the member. In other words, the first other-side receiving coil 36 and the second other-side receiving coil 37 each generate an induced electromotive force corresponding to the position of the first other-side target 23.

[0040] The two first receiving coils 34 and 36 are electrically connected. More specifically, the two first receiving coils 34 and 36 are connected in series in a direction that reinforces their outputs (in other words, their respective induced electromotive forces). Therefore, the two first receiving coils 34 and 36 output detection signals corresponding to the positions of the first targets 22 and 23. The "direction that reinforces the outputs" in relation to the series connection refers to the direction in which the outputs reinforce each other, out of the two possible directions for a series connection: one in which the outputs reinforce each other and one in which they cancel each other out. The detection signals from the first receiving coils 34 and 36 correspond to, for example, the first voltage value V1 shown in Figure 9, which will be described later. Note that the detection signals from the first receiving coils 34 and 36 refer to the detection signals output from the conductors containing the first receiving coils 34 and 36, and detection signals are not individually output from each of the two first receiving coils 34 and 36 to the receiving unit 472 (see Figure 8). This principle also applies to the following explanations.

[0041] Furthermore, the two second receiving coils 35 and 37 are also electrically connected. In detail, the two second receiving coils 35 and 37 are connected in series with respect to each other, reinforcing their outputs. Therefore, the two second receiving coils 35 and 37 output a detection signal corresponding to the position of the first targets 22 and 23. This detection signal from the second receiving coils 35 and 37 corresponds, for example, to the second voltage value V2 shown in Figure 9, which will be described later. Note that the outputs of the two first receiving coils 34 and 36 corresponding to the positions of the first targets 22 and 23 are the same. Similarly, the outputs of the two second receiving coils 35 and 37 corresponding to the positions of the first targets 22 and 23 are also the same.

[0042] Furthermore, the third one-sided receiving coil 40, which is one of the two third receiving coils 40 and 42, and the fourth one-sided receiving coil 41, which is one of the two fourth receiving coils 41 and 43, are coils for detecting the position of the second one-sided target 24 in the circumferential direction Dc of the member. In other words, the third one-sided receiving coil 40 and the fourth one-sided receiving coil 41 each generate an induced electromotive force corresponding to the position of the second one-sided target 24.

[0043] Furthermore, the third other-side receiving coil 42, which is the other of the two third receiving coils 40 and 42, and the fourth other-side receiving coil 43, which is the other of the two fourth receiving coils 41 and 43, are coils for detecting the position of the second other-side target 25 in the circumferential direction Dc of the member. In other words, the third other-side receiving coil 42 and the fourth other-side receiving coil 43 each generate an induced electromotive force corresponding to the position of the second other-side target 25.

[0044] The two third receiving coils 40 and 42 are electrically connected. More specifically, the two third receiving coils 40 and 42 are connected in series with respect to each other, reinforcing their outputs (in other words, their respective induced electromotive forces). As a result, the two third receiving coils 40 and 42 output detection signals corresponding to the positions of the second targets 24 and 25.

[0045] Furthermore, the two fourth receiving coils 41 and 43 are electrically connected. More specifically, the two fourth receiving coils 41 and 43 are connected in series with respect to each other, reinforcing their outputs. As a result, the two fourth receiving coils 41 and 43 output detection signals corresponding to the positions of the second targets 24 and 25. Note that the outputs of the two third receiving coils 40 and 42 corresponding to the positions of the second targets 24 and 25 are the same. Similarly, the outputs of the two fourth receiving coils 41 and 43 corresponding to the positions of the second targets 24 and 25 are also the same.

[0046] Each receiving coil 34-37 and 40-43 is configured such that they do not interfere with each other (i.e., do not overlap) by connecting different wiring layers via vias as appropriate. In Figure 5 and the corresponding figures described later, the vias on the substrate 30 are omitted as appropriate.

[0047] The first one-sided receiving coil 34 has a first spiral portion 34a and a second spiral portion 34b. The first and second spiral portions 34a and 34b each form a spiral pattern shape when viewed along the member axis direction Da. In other words, the first and second spiral portions 34a and 34b are each formed to draw a spirally wound planar curve when viewed along the member axis direction Da. The first and second spiral portions 34a and 34b are connected in series, for example, via a connection wiring pattern not shown. Note that the external shapes of the first and second spiral portions 34a and 34b are not limited to the shapes shown in Figure 5, and may be other shapes such as circles.

[0048] The same applies to the other receiving coils 35-37 and 40-43. Specifically, the second one-side receiving coil 35 has a first spiral section 35a and a second spiral section 35b connected in series with each other. The first other-side receiving coil 36 has a first spiral section 36a and a second spiral section 36b connected in series with each other, and the second other-side receiving coil 37 has a first spiral section 37a and a second spiral section 37b connected in series with each other.

[0049] Furthermore, the third one-side receiving coil 40 has a first spiral portion 40a and a second spiral portion 40b connected in series with each other, and the fourth one-side receiving coil 41 has a first spiral portion 41a and a second spiral portion 41b connected in series with each other. Furthermore, the third other-side receiving coil 42 has a first spiral portion 42a and a second spiral portion 42b connected in series with each other, and the fourth other-side receiving coil 43 has a first spiral portion 43a and a second spiral portion 43b connected in series with each other. These spiral portions 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, and 43b each form a spiral pattern shape when viewed along the member axis Da, similar to the spiral portions 34a and 34b of the first one-sided receiving coil 34.

[0050] The spiral portions 34a and 34b of the first one-sided receiving coil 34 are positioned so as to overlap one side of the first one-sided target 22 in the member axis direction Da at any position within the operating range W1a of the first one-sided target 22. Similarly, the spiral portions 35a and 35b of the second one-sided receiving coil 35 are positioned so as to overlap one side of the first one-sided target 22 in the member axis direction Da at any position within the operating range W1a of the first one-sided target 22.

[0051] The spiral portions 34a, 34b, 35a, and 35b are arranged in the order of first spiral portion 34a, first spiral portion 35a, second spiral portion 34b, and second spiral portion 35b, from one side to the other in the circumferential direction Dc of the member. Furthermore, the spiral portions 34a, 34b, 35a, and 35b form a single region when viewed along the axial direction Da of the member.

[0052] In other words, the first one-sided receiving coil 34 and the second one-sided receiving coil 35 form a first one-sided receiving region 301 that these receiving coils 34 and 35 occupy within the substrate 30. The first one-sided receiving coil 34 and the second one-sided receiving coil 35 constitute a first one-sided receiving coil group 301a as a combination of these receiving coils 34 and 35. This first one-sided receiving coil group 301a corresponds to one of the receiving coil groups of this disclosure.

[0053] Similarly, the spiral portions 36a and 36b of the first other-side receiving coil 36 are positioned to overlap one side of the first other-side target 23 in the member axis direction Da at any position within the operating range W1b of the first other-side target 23. The spiral portions 37a and 37b of the second other-side receiving coil 37 are also positioned to overlap one side of the first other-side target 23 in the member axis direction Da at any position within the operating range W1b of the first other-side target 23.

[0054] Furthermore, these spiral portions 36a, 36b, 37a, and 37b are arranged in the order of first spiral portion 36a, first spiral portion 37a, second spiral portion 36b, and second spiral portion 37b, from one side to the other in the circumferential direction Dc of the member. In addition, these spiral portions 36a, 36b, 37a, and 37b form a single region when viewed along the axial direction Da of the member.

[0055] In other words, the first other-side receiving coil 36 and the second other-side receiving coil 37 form a first other-side receiving region 302 that these receiving coils 36 and 37 occupy within the substrate 30. The first other-side receiving coil 36 and the second other-side receiving coil 37 constitute a first other-side receiving coil group 302a as a combination of these receiving coils 36 and 37. This first other-side receiving coil group 302a corresponds to the other receiving coil group of this disclosure.

[0056] Furthermore, the spiral portions 40a and 40b of the third one-sided receiving coil 40 are positioned so as to overlap one side of the second one-sided target 24 in the member axis direction Da at any position within the operating range W2a of the second one-sided target 24. Similarly, the spiral portions 41a and 41b of the fourth one-sided receiving coil 41 are positioned so as to overlap one side of the second one-sided target 24 in the member axis direction Da at any position within the operating range W2a of the second one-sided target 24.

[0057] The spiral portions 40a, 40b, 41a, and 41b are arranged in the order of first spiral portion 40a, first spiral portion 41a, second spiral portion 40b, and second spiral portion 41b, from one side to the other in the circumferential direction Dc of the member. Furthermore, the spiral portions 40a, 40b, 41a, and 41b form a single region when viewed along the axial direction Da of the member.

[0058] In other words, the third one-sided receiving coil 40 and the fourth one-sided receiving coil 41 form a second one-sided receiving region 303 that these receiving coils 40 and 41 occupy within the substrate 30. The third one-sided receiving coil 40 and the fourth one-sided receiving coil 41 constitute a second one-sided receiving coil group 303a as a combination of these receiving coils 40 and 41.

[0059] Furthermore, the spiral portions 42a and 42b of the third other-side receiving coil 42 are positioned to overlap one side of the second other-side target 25 in the member axis direction Da at any position within the operating range W2b of the second other-side target 25. Similarly, the spiral portions 43a and 43b of the fourth other-side receiving coil 43 are also positioned to overlap one side of the second other-side target 25 in the member axis direction Da at any position within the operating range W2b of the second other-side target 25.

[0060] The spiral portions 42a, 42b, 43a, and 43b are arranged in the order of first spiral portion 42a, first spiral portion 43a, second spiral portion 42b, and second spiral portion 43b, from one side to the other in the circumferential direction Dc of the member. Furthermore, the spiral portions 42a, 42b, 43a, and 43b form a single region when viewed along the axial direction Da of the member.

[0061] In other words, the third other-side receiving coil 42 and the fourth other-side receiving coil 43 form a second other-side receiving region 304 that these receiving coils 42 and 43 occupy within the substrate 30. The third other-side receiving coil 42 and the fourth other-side receiving coil 43 constitute a second other-side receiving coil group 304a as a combination of these receiving coils 42 and 43.

[0062] Figure 7 shows the receiving coils 34-37 and 40-43 shown in Figure 5 replaced with the above-mentioned receiving regions 301, 302, 303, and 304. The first one-sided receiving region 301 and the first other-sided receiving region 302 described above correspond to the first receiving region of this disclosure, and the second one-sided receiving region 303 and the second other-sided receiving region 304 correspond to the second receiving region of this disclosure.

[0063] As shown in Figures 5 and 7, the spiral portions 34a to 43b of the receiving coils 34 to 37 and 40 to 43 are arranged in the circumferential direction Dc of the member so as a whole that they form an annular shape around the rotation axis CL. That is, the four receiving regions 301 to 304 are also arranged in the circumferential direction Dc of the member so as a whole that they form an annular shape around the rotation axis CL. The spiral portions 34a to 43b mentioned above refer to spiral portions 34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, and 43b.

[0064] The four receiving regions 301 to 304 are arranged in the order of first one-sided receiving region 301, second other-sided receiving region 304, first other-sided receiving region 302, and second one-sided receiving region 303, from one side to the other in the circumferential direction Dc of the member. Specifically, the four receiving regions 301 to 304 are arranged at 90-degree intervals in the circumferential direction Dc of the member with respect to the rotation axis CL.

[0065] Therefore, the first one-sided receiving region 301 is located on the opposite side of the rotation axis CL from the first other-sided receiving region 302, and the second one-sided receiving region 303 is located on the opposite side of the rotation axis CL from the second other-sided receiving region 304. In other words, the first one-sided receiving coil group 301a is located on the opposite side of the rotation axis CL from the first other-sided receiving coil group 302a, and the second one-sided receiving coil group 303a is located on the opposite side of the rotation axis CL from the second other-sided receiving coil group 304a.

[0066] For confirmation, in the circumferential direction Dc of the member, the one end position P1 of the first one-side receiving region 301 (i.e., the one-side end position P1 in the circumferential direction) coincides with the one end position of the first one-side receiving coil 34 (i.e., the one-side end position of the first spiral portion 34a). Furthermore, in the circumferential direction Dc of the member, the other end position P2 of the first one-side receiving region 301 (i.e., the other-side end position P2 in the circumferential direction) coincides with the other end position of the second one-side receiving coil 35 (i.e., the other end position of the second spiral portion 35b). This relationship is also true for the first other-side receiving region 302, the second one-side receiving region 303, and the second other-side receiving region 304.

[0067] As shown in Figures 1 and 7, the first one-sided target 22 moves back and forth in the circumferential direction Dc of the member within its operating range W1a, as described above. However, the operating range W1a of the first one-sided target 22 is configured such that the first one-sided target 22 does not overlap with the other side in the member axial direction Da with respect to the second one-sided receiving area 303 and the second other-sided receiving area 304. In other words, the first one-sided target 22 moves back and forth within a range that is outside the circumferential direction Dc of the member with respect to the second one-sided receiving area 303 and the second other-sided receiving area 304.

[0068] The same applies to the other operating ranges W1b, W2a, and W2b. Specifically, the operating range W1b of the first other-side target 23 is configured such that the first other-side target 23 does not overlap with the other side of the member axis direction Da with respect to the second one-side receiving area 303 and the second other-side receiving area 304. Similarly, the operating range W2a of the second one-side target 24 is configured such that the second one-side target 24 does not overlap with the other side of the member axis direction Da with respect to the first one-side receiving area 301 and the first other-side receiving area 302. Furthermore, the operating range W2b of the second other-side target 25 is configured such that the second other-side target 25 does not overlap with the other side of the member axis direction Da with respect to the first one-side receiving area 301 and the first other-side receiving area 302.

[0069] More specifically, the first one-sided target 22 moves back and forth without extending beyond the range of the other side of the circumferential end position P1 of the first one-sided receiving region 301 and the other side of the circumferential end position P2 of the first one-sided receiving region 301 in the circumferential direction Dc of the member. This is also true for the positional relationship between the other targets 23, 24, and 25 and the receiving regions 302, 303, and 304.

[0070] Furthermore, the operating range W1a of the first one-sided target 22 is a range distributed in the circumferential direction Dc of the member, centered on the central position 301b of the first one-sided receiving area 301 in the circumferential direction Dc of the member. More specifically, the operating range W1a is symmetrical in the circumferential direction Dc of the member with respect to the central position 301b of the first one-sided receiving area 301 in the circumferential direction Dc of the member. However, the "symmetry" of the operating range W1a is not strictly defined. This also applies to the "symmetry" of the other operating ranges W1b, W2a, and W2b, which will be described later.

[0071] Similarly, the operating range W1b of the first other-side target 23 is a range distributed in the circumferential direction Dc of the member, centered on the central position 302b of the first other-side receiving area 302 in the circumferential direction Dc of the member. More specifically, its operating range W1b is symmetrical in the circumferential direction Dc of the member with respect to the central position 302b of the first other-side receiving area 302 in the circumferential direction Dc of the member.

[0072] Furthermore, the operating range W2a of the second one-sided target 24 is a range distributed in the circumferential direction Dc of the member, centered on the central position 303b of the second one-sided receiving area 303 in the circumferential direction Dc of the member. More specifically, its operating range W2a is symmetrical in the circumferential direction Dc of the member with respect to the central position 303b of the second one-sided receiving area 303 in the circumferential direction Dc of the member.

[0073] Furthermore, the operating range W2b of the second other-side target 25 is a range distributed in the circumferential direction Dc of the member, centered on the central position 304b of the second other-side receiving area 304 in the circumferential direction Dc of the member. More specifically, its operating range W2b is symmetrical in the circumferential direction Dc of the member with respect to the central position 304b of the second other-side receiving area 304 in the circumferential direction Dc of the member.

[0074] As shown in Figure 8, in addition to the coils 31, 32, 34-37, and 40-43 mentioned above, various other electrical components are mounted on the circuit board 30. Specifically, the circuit board 30 also has multiple capacitors 451, 452, 461, and 462, an IC that constitutes the first signal processing unit 47, an IC that constitutes the second signal processing unit 48, a first terminal 49, and a second terminal 50 mounted on it.

[0075] The first transmitting coil 31, two first receiving coils 34 and 36, two second receiving coils 35 and 37, two capacitors 451 and 452, a first signal processing unit 47, and a first terminal 49 constitute the first system 305. On the other hand, the second transmitting coil 32, two third receiving coils 40 and 42, two fourth receiving coils 41 and 43, two capacitors 461 and 462, a second signal processing unit 48, and a second terminal 50 constitute the second system 306. Since the first system 305 and the second system 306 are configured as independent electrical circuits, the position detection device 1 can detect the rotational position of the rotating member 20 by the other system even if one of the first system 305 or the second system 306 fails.

[0076] The first and second signal processing units 47 and 48, respectively, are configured as in-vehicle microcomputers equipped with a CPU, RAM, ROM, non-volatile rewritable memory, etc. (not shown). That is, the first and second signal processing units 47 and 48, respectively, read and execute a computer program stored in the ROM or non-volatile rewritable memory, which are non-transitional physical recording media. When this computer program is executed, the method corresponding to the computer program is executed. This configuration is also the same for the electronic control unit 72, which will be described later. CPU stands for Central Processing Unit, ROM stands for Read Only Memory, and RAM stands for Random Access Memory.

[0077] The first signal processing unit 47 is connected to a first transmitting coil 31, two first receiving coils 34 and 36, and two second receiving coils 35 and 37, respectively. In addition, two capacitors 451 and 452 are connected in series between both ends of the first transmitting coil 31 and the first signal processing unit 47, and the part connecting each of the capacitors 451 and 452 is connected to ground. The first signal processing unit 47 is then connected to an electronic control unit 72 located outside the position detection device 1 via a first terminal 49 fixed to the circuit board 30.

[0078] The connection relationships around the second signal processing unit 48 are similar. Specifically, the second signal processing unit 48 is connected to the second transmitting coil 32, two third receiving coils 40 and 42, and two fourth receiving coils 41 and 43, respectively. In addition, two capacitors 461 and 462 are connected in series between both ends of the second transmitting coil 32 and the second signal processing unit 48, and the part connecting each of the capacitors 461 and 462 is connected to ground. The second signal processing unit 48 is then connected to an external electronic control unit 72 via a second terminal 50 fixed to the circuit board 30. In this way, the first signal processing unit 47 and the second signal processing unit 48 output the rotational position (in other words, the rotational angle) of the rotating member 20 separately to the electronic control unit 72.

[0079] Next, the operation of the first signal processing unit 47 described above will be explained.

[0080] As shown in Figure 8, the first signal processing unit 47 comprises an oscillator 471 and a receiver 472. The oscillator 471 is connected to both ends of the first transmitting coil 31 and applies an alternating current of a predetermined frequency to the first transmitting coil 31. As a result, the first transmitting coil 31 generates a magnetic field with a member axial direction Da that passes through the receiving coils 34-37 and 40-43. This magnetic field induces currents to flow through the receiving coils 34-37 and 40-43, respectively.

[0081] The receiver 472 is connected to two first receiving coils 34 and 36 in series, and to two second receiving coils 35 and 37 in series. The receiver 472 acquires a converted signal (i.e., the first voltage value V1 in Figure 9) obtained by demodulating and performing AD conversion on the outputs from the two first receiving coils 34 and 36. The output from the two first receiving coils 34 and 36 is the sum of the output from one of the two first receiving coils 34 and 36 and the output from the other. The receiver 472 also acquires a converted signal (i.e., the second voltage value V2 in Figure 9) obtained by demodulating and performing AD conversion on the outputs from the two second receiving coils 35 and 37. The output from the two second receiving coils 35 and 37 is the sum of the output from one of the two second receiving coils 35 and 37 and the output from the other.

[0082] The receiving unit 472 then calculates the rotation angle (in other words, the rotation position) of the rotating member 20 by, for example, calculating an inverse tangent function using the acquired conversion signals. The relationship between the electrical angle θ in the electrical signals of the first and second receiving coils 34, 36, 35, and 37 and the rotation angle (i.e., mechanical angle) of the rotating member 20 is predetermined, for example, according to the size of the first targets 22 and 23 and the receiving coils 34, 36, 35, and 37. Therefore, the rotation member 20 can be calculated based on the electrical angle θ. For example, in this embodiment, the relationship between the electrical angle θ and the mechanical angle is the same for all of the receiving coil groups 301a, 302a, 303a, and 304a.

[0083] When the receiving unit 472 calculates or determines the rotational position of the rotating member 20 based on the detection signals from the first and second receiving coils 34, 36, 35, and 37, it outputs a signal indicating the rotational position of the rotating member 20 to the external electronic control unit 72 via the first terminal 49.

[0084] The above describes the basic operation of the first signal processing unit 47. The second signal processing unit 48 also has an oscillator 481 and a receiver 482, similar to the first signal processing unit 47. The oscillator 481 of the second signal processing unit 48 is the same as the oscillator 471 of the first signal processing unit 47, and the receiver 482 of the second signal processing unit 48 is the same as the receiver 472 of the first signal processing unit 47. The operation of the second signal processing unit 48 is the same as the operation of the first signal processing unit 47, so the explanation of the operation of the second signal processing unit 48 will be omitted.

[0085] Next, we will explain the first voltage value V1 of the first receiving coils 34 and 36 and the second voltage value V2 of the second receiving coils 35 and 37 when the rotating member 20 is rotated.

[0086] For example, when an alternating current of a predetermined frequency is applied to the first transmitting coil 31, a magnetic field with a member-axial direction Da is generated passing through the first receiving coil 34 and the second receiving coil 35 of the first receiving coil group 301a. Furthermore, because the magnetic field changes due to the alternating current, an induced electromotive force is generated in both the first receiving coil 34 and the second receiving coil 35 by electromagnetic induction.

[0087] When the first one-sided target 22 faces the first transmitting coil 31, the first one-sided receiving coil 34, and the second one-sided receiving coil 35, eddy currents are generated in the first one-sided target 22, and a magnetic field is generated due to these eddy currents. As a result, the portion of the magnetic field passing through the first one-sided receiving coil 34 and the second one-sided receiving coil 35 in the axial direction Da that faces the first one-sided target 22 is canceled out by the magnetic field caused by the eddy currents.

[0088] As the rotating member 20 rotates, the position and size of the parts of the first one-sided receiving coil 34 and the second one-sided receiving coil 35 that face the first one-sided target 22 change. The above explanation uses the first one-sided receiving coil group 301a as an example, but the same applies to the first other-sided receiving coil group 302a.

[0089] Therefore, as the rotating member 20 rotates, the first voltage value V1 generated in the first receiving coils 34 and 36 and the second voltage value V2 generated in the second receiving coils 35 and 37 change periodically. In this embodiment, for example, as shown in Figure 9, the first voltage value V1 generated in the first receiving coils 34 and 36 is sinusoidal, and the second voltage value V2 generated in the second receiving coils 35 and 37 is cosine-shaped with the same wavelength as the first voltage value V1.

[0090] Furthermore, the voltage values ​​generated in the third receiving coils 40 and 42, and the voltage values ​​generated in the fourth receiving coils 41 and 43 are the same as described above, so their explanation will be omitted.

[0091] As described above, according to this embodiment, the first one-sided target 22 reciprocates in the circumferential direction Dc of the member. The first one-sided target 22 reciprocates within an operating range W1a in which the first one-sided target 22 does not overlap with the other side in the member axial direction Da with respect to the second one-sided receiving region 303 and the second other-sided receiving region 304.

[0092] Therefore, interference from the first one-sided target 22 with the magnetic flux passing through the third and fourth receiving coils 40, 42, 41, and 43 for detecting the positions of the second targets 24 and 25 can be avoided. Consequently, the influence of the first one-sided target 22 on the output values ​​(i.e., each detection signal) of the third and fourth receiving coils 40, 42, 41, and 43 can be reduced.

[0093] Furthermore, the first one-sided target 22 and the first other-sided target 23 operate without affecting the signal processing of the second system 306, and the second one-sided target 24 and the second other-sided target 25 operate without affecting the signal processing of the first system 305. Therefore, the independence of the first system 305 and the second system 306 can be guaranteed.

[0094] (1) Furthermore, according to this embodiment, the operating range W1a of the first one-sided target 22 is a range distributed in the circumferential direction Dc of the member, with the center position 301b of the first one-sided receiving area 301 in the circumferential direction Dc of the member as the center. Therefore, it is possible to widen the operating range W1a of the first one-sided target 22 by making maximum use of the length that the first one-sided receiving area 301 has in the circumferential direction Dc of the member.

[0095] (2) Furthermore, according to this embodiment, the first one-sided target 22 moves back and forth without extending beyond the range of the other side of the circumferential end position P1 of the first one-sided receiving region 301 and the other side of the circumferential end position P2 of the first one-sided receiving region 301 in the circumferential direction Dc of the member. This makes it possible to further reduce the influence of the first one-sided target 22 on the output values ​​of the third and fourth receiving coils 40, 42, 41, and 43.

[0096] (3) Furthermore, according to this embodiment, in a view along the axial direction Da of the member, all the receiving coils 34-37 and 40-43 of the substrate 30 are arranged inside the first transmitting coil 31 and inside the second transmitting coil 32.

[0097] Therefore, even if, for example, one of the first transmitting coil 31 or the second transmitting coil 32 becomes unable to conduct electricity due to a broken wire or the like, the other transmitting coil can still induce current in all the receiving coils 34-37 and 40-43. Furthermore, compared to a configuration in which the receiving coils 34, 36, 35, and 37 belonging to the first system 305 and the receiving coils 40, 42, 41, and 43 belonging to the second system 306 are separately enclosed by the first transmitting coil 31 and the second transmitting coil 32, the area required by the first and second transmitting coils 31 and 32 can be reduced.

[0098] (4) Furthermore, according to this embodiment, each of the spiral portions 34a to 43b of the receiving coils 34 to 37 and 40 to 43 forms a spiral pattern shape when viewed in the direction along the member axis Da. Therefore, compared to the case in which each receiving coil 34 to 37 and 40 to 43 is formed by a pattern shape that draws a sine wave or cosine wave, for example, the number of wiring layers formed on the substrate 30 is reduced, making it possible to manufacture more easily.

[0099] (5) Furthermore, according to this embodiment, as shown in Figures 1 and 5, the first one-sided target 22 is positioned on the opposite side of the rotation axis CL from the first other-sided target 23. The first one-sided receiving coil group 301a is positioned on the opposite side of the rotation axis CL from the first other-sided receiving coil group 302a.

[0100] This makes it possible to easily obtain a configuration that reduces the influence of misalignment of the rotating member 20 on the output of the position detection device 1, which represents the rotational position of the rotating member 20; in short, a configuration that is resistant to misalignment of the rotating member 20.

[0101] For example, consider the case in Figure 1 where the rotating member 20 is misaligned towards the upper side of the paper. In that case, looking at the first system 305, in the first one-sided receiving region 301, the projected area of ​​the first one-sided target 22 that overlaps the first and second one-sided receiving coils 34 and 35 will decrease due to the misalignment of the rotating member 20. Conversely, in the first other-sided receiving region 302, the projected area of ​​the first other-sided target 23 that overlaps the first and second other-sided receiving coils 36 and 37 will increase due to the misalignment of the rotating member 20. And if the projected area of ​​the target changes, the output of the receiving coil will also change accordingly.

[0102] Furthermore, assuming that the direction from one side to the other in the circumferential direction Dc of the member is the positive direction, when we look at the second system 306, the second one-side target 24 advances due to the misalignment of the rotating member 20, and conversely, the second other-side target 25 retards due to the misalignment of the rotating member 20.

[0103] Thus, between the first one-sided receiving coil group 301a and the first other-sided receiving coil group 302a, which are arranged point-symmetrically with respect to the rotation axis CL and belong to the first system 305, opposite phenomena occur due to the misalignment of the rotating member 20. Similarly, between the second one-sided receiving coil group 303a and the second other-sided receiving coil group 304a, which are arranged point-symmetrically with respect to the rotation axis CL and belong to the second system 306, opposite phenomena occur due to the misalignment of the rotating member 20.

[0104] Therefore, by utilizing the fact that the opposite phenomenon described above occurs in the first system 305, a configuration that is resistant to misalignment of the rotating member 20 can be easily obtained in the first system 305. And by utilizing the fact that the opposite phenomenon described above occurs in the second system 306, a configuration that is resistant to misalignment of the rotating member 20 can also be easily obtained in the second system 306.

[0105] For example, in this embodiment, the two first receiving coils 34 and 36 in the first system 305 are connected in series as described above, so the effect of the misalignment of the rotating member 20 on the coil output is canceled out between the two first receiving coils 34 and 36. Similarly, the effect of the misalignment of the rotating member 20 on the coil output is canceled out between the two second receiving coils 35 and 37 which are connected in series. The same is true for the second system 306. Therefore, as described above, a configuration that is resistant to misalignment of the rotating member 20 can be easily obtained in the first system 305, and a configuration that is resistant to misalignment of the rotating member 20 can also be easily obtained in the second system 306.

[0106] Furthermore, the angular position sensor described in Patent Document 1 is considered to be weaker against misalignment of the rotating member compared to the position detection device 1 of this embodiment. This is because the angular position sensor in Patent Document 1 does not employ a structure in which the effect of misalignment of the rotating member on the coil output is canceled out between the two receiving coils arranged on either side of the rotation axis.

[0107] Furthermore, according to this embodiment, as shown in Figures 2 and 5, all transmitting and receiving coils 31, 32, 34-37, and 40-43 are formed on a single substrate 30, and all targets 22-25 are arranged on one side of the substrate 30 in the member axis direction Da. Therefore, compared to a configuration in which, for example, the first targets 22 and 23 are arranged on one side of the substrate 30 in the member axis direction Da and the second targets 24 and 25 are arranged on the other side of the substrate 30 in the member axis direction Da, the size of the position detection device 1 can be reduced.

[0108] (Second Embodiment) Next, a second embodiment will be described. In this embodiment, the differences from the first embodiment described above will be mainly explained. Furthermore, parts that are the same as or equivalent to the above embodiment will be omitted or simplified in their description. The same applies to the descriptions of the embodiments described later.

[0109] As shown in Figure 10, the pattern shapes of the receiving coils 34-37 and 40-43 in this embodiment differ from those in the first embodiment. Therefore, the spiral portions 34a-43b (see Figure 5) of the first embodiment are not provided in this embodiment.

[0110] In this embodiment, as in the first embodiment, when viewed along the member axis Da, all receiving coils 34-37 and 40-43 are arranged inside the first transmitting coil 31 and inside the second transmitting coil 32. Each receiving coil 34-37 and 40-43 is configured such that they do not interfere with each other (i.e., do not overlap) by appropriately connecting different wiring layers via vias 30d.

[0111] In this embodiment, each receiving coil 34-37 and 40-43 is constructed by connecting two adjacent wiring layers in sequentially stacked wiring layers with vias 30d. For example, in this embodiment, each receiving coil 34-37 and 40-43 is formed by connecting the outermost wiring layer located on the other side 30b of the substrate 30 with the wiring layer that is the next layer after the outermost layer. In Figure 10, the wiring layers formed on the outermost layer of the substrate 30 are shown with solid lines, and the wiring layers formed on the next layer after the outermost layer are shown with dashed lines. Also, the transmitting coils 31 and 32 are all shown with solid lines.

[0112] Specifically, the first one-sided receiving coil 34 has a first corrugated portion 34d and a second corrugated portion 34e. The first and second corrugated portions 34d and 34e each have a pattern shape that draws a sinusoidal curve when viewed in the direction along the member axis Da. The first and second corrugated portions 34d and 34e are connected in series, for example, via a connecting wiring pattern, to form a closed loop.

[0113] Furthermore, the second one-sided receiving coil 35 has a first wavy portion 35d and a second wavy portion 35e. The first and second wavy portions 35d and 35e each have a pattern shape that, when viewed in the direction along the member axis Da, draws a sinusoidal curve with a phase shift in the member circumferential direction Dc relative to the first and second wavy portions 34d and 34e of the first one-sided receiving coil 34. The first and second wavy portions 35d and 35e are connected in series, for example, via a connecting wiring pattern, forming a closed loop. For example, the wavy portions 34d, 34e, 35d, and 35e of the first and second one-sided receiving coils 34 and 35 are arranged so as to overlap one side of the member axis Da with respect to the first one-sided target 22 at any position within the operating range W1a of the first one-sided target 22.

[0114] The same applies to the other receiving coil groups 302a, 303a, and 304a, other than the first receiving coil group 301a which includes the receiving coils 34 and 35 described above. Specifically, the first other receiving coil 36 has a first wave-shaped portion 36d and a second wave-shaped portion 36e that are connected in series and have a pattern shape that draws a sinusoidal curve when viewed in the direction along the member axis Da. The second other receiving coil 37 has a first wave-shaped portion 37d and a second wave-shaped portion 37e that are connected in series and have a pattern shape that draws a sinusoidal curve with a phase shift in the member circumferential direction Dc relative to the first and second wave-shaped portions 36d and 36e when viewed in the direction along the member axis Da. For example, the corrugated portions 36d, 36e, 37d, and 37e of the first and second other-side receiving coils 36 and 37 are arranged so as to overlap one side in the member axis direction Da with respect to the first other-side target 23 at any position within the operating range W1b of the first other-side target 23.

[0115] Furthermore, the third one-sided receiving coil 40 has a pattern shape that draws a sinusoidal curve when viewed in the direction along the member axis direction Da, and has a first wave-shaped portion 40d and a second wave-shaped portion 40e connected in series with respect to each other. Furthermore, the fourth one-sided receiving coil 41 has a pattern shape that draws a sinusoidal curve with a phase shift in the member circumferential direction Dc relative to the first and second wave-shaped portions 40d and 40e when viewed in the direction along the member axis direction Da, and has a first wave-shaped portion 41d and a second wave-shaped portion 41e connected in series with respect to each other. For example, the wave-shaped portions 40d, 40e, 41d, and 41e of the third and fourth one-sided receiving coils 40 and 41 are arranged so that they overlap one side of the member axis direction Da with respect to the second one-sided target 24 at any position within the operating range W2a of the second one-sided target 24.

[0116] Furthermore, the third other-side receiving coil 42 has a pattern shape that draws a sinusoidal curve when viewed in the direction along the member axis direction Da, and has a first wave-shaped portion 42d and a second wave-shaped portion 42e connected in series with respect to each other. Furthermore, the fourth other-side receiving coil 43 has a pattern shape that draws a sinusoidal curve with a phase shift in the member circumferential direction Dc relative to the first and second wave-shaped portions 42d and 42e when viewed in the direction along the member axis direction Da, and has a first wave-shaped portion 43d and a second wave-shaped portion 43e connected in series with respect to each other. For example, the wave-shaped portions 42d, 42e, 43d, and 43e of the third and fourth other-side receiving coils 42 and 43 are arranged so that they overlap one side of the member axis direction Da with respect to the second other-side target 25 at any position within the operating range W2b of the second other-side target 25.

[0117] In this embodiment, the circumferential end position P1 of the first one-sided receiving region 301 coincides with the one-sided end position of the second one-sided receiving coil 35 in the circumferential direction Dc of the member. The other circumferential end position P2 of the first one-sided receiving region 301 coincides with the other-sided end position of the second one-sided receiving coil 35 in the circumferential direction Dc of the member. This relationship is also true for the first other-sided receiving region 302, the second one-sided receiving region 303, and the second other-sided receiving region 304.

[0118] (1) As described above, according to this embodiment, each of the corrugated portions 34d to 43e of the receiving coils 34 to 37 and 40 to 43 has a pattern shape that draws a sinusoidal curve when viewed in the direction along the member axis Da. Therefore, it is possible to output a sinusoidal or cosine wave electrical signal with a phase difference from the receiving coils 34 to 37 and 40 to 43. Note that the above-mentioned corrugated portions 34d to 43e refer to corrugated portions 34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, and 43e.

[0119] Except as described above, this embodiment is the same as the first embodiment. In this embodiment, the effects obtained from the configuration common to the first embodiment can be obtained in the same way as in the first embodiment.

[0120] (Third embodiment) Next, a third embodiment will be described. This embodiment will primarily describe the differences from the first embodiment described above.

[0121] As shown in Figure 11, the substrate 30 of this embodiment has two first transmitting coils 311 and 312 instead of the first transmitting coil 31 of the first embodiment (see Figure 5), and two second transmitting coils 321 and 322 instead of the second transmitting coil 32 of the first embodiment (see Figure 5).

[0122] The two first transmitting coils 311 and 312 are the first one-side transmitting coil 311 and the first other-side transmitting coil 312. The two second transmitting coils 321 and 322 are the second one-side transmitting coil 321 and the second other-side transmitting coil 322.

[0123] The first one-sided transmitting coil 311 and the first other-sided transmitting coil 312 are connected in series. Therefore, for example, when current flows through the first one-sided transmitting coil 311, current also flows through the first other-sided transmitting coil 312 at the same time. At this time, the direction of the current flowing through the first one-sided transmitting coil 311 around the first one-sided receiving coil group 301a is the same as the direction of the current flowing through the first other-sided transmitting coil 312 around the first other-sided receiving coil group 302a. In short, if current flows clockwise through the first one-sided transmitting coil 311, current will also flow clockwise through the first other-sided transmitting coil 312, and if current flows counterclockwise through the first one-sided transmitting coil 311, current will also flow counterclockwise through the first other-sided transmitting coil 312.

[0124] Furthermore, the second one-sided transmitting coil 321 and the second other-sided transmitting coil 322 are also connected in series. Therefore, for example, when current flows through the second one-sided transmitting coil 321, current also flows through the second other-sided transmitting coil 322 at the same time. At this time, the direction of the current flowing through the second one-sided transmitting coil 321 around the second one-sided receiving coil group 303a is the same as the direction of the current flowing through the second other-sided transmitting coil 322 around the second other-sided receiving coil group 304a. In short, if current flows clockwise through the second one-sided transmitting coil 321, current will also flow clockwise through the second other-sided transmitting coil 322, and if current flows counterclockwise through the second one-sided transmitting coil 321, current will also flow counterclockwise through the second other-sided transmitting coil 322.

[0125] Furthermore, when viewed along the axial direction Da of the member, the first and second one-sided receiving coils 34 and 35 are positioned inside the first one-sided transmitting coil 311, while the other receiving coils 36, 37, 40-43 are positioned outside the first one-sided transmitting coil 311. Therefore, when an alternating current flows through the first one-sided transmitting coil 311, an induced current flows through the first and second one-sided receiving coils 34 and 35 due to electromagnetic induction caused by the energization of the first one-sided transmitting coil 311.

[0126] Furthermore, when viewed along the axial direction Da of the member, the first and second other-side receiving coils 36 and 37 are positioned inside the first other-side transmitting coil 312, while the other receiving coils 34, 35, 40-43 are positioned outside the first other-side transmitting coil 312. Therefore, when an alternating current flows through the first other-side transmitting coil 312, an induced current flows through the first and second other-side receiving coils 36 and 37 due to electromagnetic induction caused by the energization of the first other-side transmitting coil 312.

[0127] Furthermore, when viewed along the axial direction Da of the member, the third and fourth one-sided receiving coils 40 and 41 are positioned inside the second one-sided transmitting coil 321, while the other receiving coils 34-37, 42, and 43 are positioned outside the second one-sided transmitting coil 321. Therefore, when an alternating current flows through the second one-sided transmitting coil 321, an induced current flows through the third and fourth one-sided receiving coils 40 and 41 due to electromagnetic induction caused by the energization of the second one-sided transmitting coil 321.

[0128] Furthermore, when viewed along the axial direction Da of the member, the third and fourth other-side receiving coils 42 and 43 are positioned inside the second other-side transmitting coil 322, while the other receiving coils 34-37, 40, and 41 are positioned outside the second other-side transmitting coil 322. Therefore, when an alternating current flows through the second other-side transmitting coil 322, an induced current flows through the third and fourth other-side receiving coils 42 and 43 due to electromagnetic induction caused by the energization of the second other-side transmitting coil 322.

[0129] The multiple transmitting coils 311, 312, 321, and 322 are arranged in the order of first one-side transmitting coil 311, second other-side transmitting coil 322, first other-side transmitting coil 312, and second one-side transmitting coil 321, with intervals between them from one side to the other in the circumferential direction Dc of the member. The individual shapes of these transmitting coils 311, 312, 321, and 322 form a fan shape, and the transmitting coils 311, 312, 321, and 322 as a whole are arranged to form an annular shape around the rotation axis CL.

[0130] Except as described above, the first one-sided transmitting coil 311 and the first other-sided transmitting coil 312 are the same as the first transmitting coil 31 in the first embodiment, and the second one-sided transmitting coil 321 and the second other-sided transmitting coil 322 are the same as the second transmitting coil 32 in the first embodiment.

[0131] (1) With the configuration of the transmitting coils 311, 312, 321, and 322 described above, it is possible to generate electromagnetic induction on each receiving coil separately for each receiving coil group 301a, 302a, 303a, and 304a.

[0132] In this embodiment, each transmitting coil 311, 312, 321, and 322 may be formed on the same wiring layer on the substrate 30.

[0133] Except as described above, this embodiment is the same as the first embodiment. In this embodiment, the effects obtained from the configuration common to the first embodiment can be obtained in the same way as in the first embodiment.

[0134] (Fourth Embodiment) Next, a fourth embodiment will be described. This embodiment will primarily describe the differences from the third embodiment described above.

[0135] As shown in Figure 12, each receiving coil 34-37 and 40-43 in this embodiment has the pattern shape of the second embodiment instead of the pattern shape of the third embodiment.

[0136] In other words, in this embodiment, the spiral portions 34a to 43b (see Figure 11) are not provided. Instead, the first one-sided receiving coil 34 has a first wavy portion 34d and a second wavy portion 34e, similar to the second embodiment, and the second one-sided receiving coil 35 has a first wavy portion 35d and a second wavy portion 35e, similar to the second embodiment. Furthermore, the first other-sided receiving coil 36 has a first wavy portion 36d and a second wavy portion 36e, similar to the second embodiment, and the second other-sided receiving coil 37 has a first wavy portion 37d and a second wavy portion 37e, similar to the second embodiment.

[0137] Furthermore, the third one-sided receiving coil 40 has a first wave-shaped portion 40d and a second wave-shaped portion 40e, similar to the second embodiment, and the fourth one-sided receiving coil 41 has a first wave-shaped portion 41d and a second wave-shaped portion 41e, similar to the second embodiment. Furthermore, the third other-sided receiving coil 42 has a first wave-shaped portion 42d and a second wave-shaped portion 42e, similar to the second embodiment, and the fourth other-sided receiving coil 43 has a first wave-shaped portion 43d and a second wave-shaped portion 43e, similar to the second embodiment.

[0138] Except as described above, this embodiment is the same as the third embodiment. In this embodiment, the effects obtained from the configuration common to the third embodiment can be obtained in the same way as in the third embodiment.

[0139] (Fifth embodiment) Next, a fifth embodiment will be described. This embodiment will primarily describe the differences from the first embodiment described above.

[0140] As shown in Figure 13, the first signal processing unit 47 includes a first fault detection unit 473, and the second signal processing unit 48 includes a second fault detection unit 483. This is a difference in this embodiment compared to the first embodiment.

[0141] Specifically, the first fault detection unit 473 executes the control process shown in Figure 14. The flowchart in Figure 14 is executed repeatedly and periodically.

[0142] As shown in Figure 14, the first fault detection unit 473 first acquires detection signals output from two series-connected first receiving coils 34 and 36 from the receiving unit 472 in step S01. At the same time, the first fault detection unit 473 also acquires detection signals output from two series-connected second receiving coils 35 and 37 from the receiving unit 472. As shown in Figure 9, the magnitude of the detection signal output from the first receiving coils 34 and 36 is specifically the first voltage value V1, and the magnitude of the detection signal output from the second receiving coils 35 and 37 is specifically the second voltage value V2.

[0143] As described above, the first voltage value V1 changes sinusoidally with respect to the electrical angle θ corresponding to the rotational position of the rotating member 20, and the second voltage value V2 changes cosinely with respect to its electrical angle θ, synchronously with respect to the first voltage value V1. In short, the first voltage value V1 and the second voltage value V2 change with respect to the electrical angle θ as shown in Figure 9. From this and the following equation F1, which is a trigonometric formula, it is considered that the judgment value Vx calculated from the following equation F2 will remain constant even if the electrical angle θ changes, provided there is no error in each detection signal. sin 2 θ+cos 2 θ=1 ···(F1) Vx=V1 2 +V2 2 ...(F2)

[0144] Therefore, in step S01 of Figure 14, the determination value Vx is calculated from the above formula F2 based on the first voltage value V1 and the second voltage value V2. After step S01, the process proceeds to step S02.

[0145] In step S02, the first fault detection unit 473 detects a fault based on the determination value Vx. Specifically, the fault detected in step S02 is a fault in a component of the position detection device 1 that is related to the detection signal output from the first receiving coils 34 and 36 or the detection signal output from the second receiving coils 35 and 37.

[0146] In detail, as described above, ideally the determination value Vx should not change with respect to the electrical angle θ. Therefore, when the change in the determination value Vx with respect to the electrical angle θ exceeds a predetermined limit, the first fault detection unit 473 determines that a fault has occurred. In other words, the first fault detection unit 473 determines that a fault has been detected.

[0147] For example, a fault may be detected if the judgment value Vx calculated from the above formula F2 falls outside a predetermined tolerance range that includes the ideal value of the judgment value Vx. The ideal value of the judgment value Vx is the judgment value Vx when there is no error between the first voltage value V1 and the second voltage value V2. Alternatively, a fault may be detected if the rate at which the judgment value Vx calculated from the above formula F2 changes with respect to the electrical angle θ (i.e., the rate of change) exceeds a predetermined limit value.

[0148] If a fault is detected in step S02, proceed to step S03. On the other hand, if no fault is detected, this flowchart ends and starts again from step S01.

[0149] In step S03, the first fault detection unit 473 outputs a message indicating that a fault has been detected. This message indicating that a fault has been detected is input to the external electronic control unit 72 via the first terminal 49.

[0150] The detection of faults based on the first voltage value V1 and the second voltage value V2 is as described above. Note that the operation of the second fault detection unit 483 shown in Figure 13 is the same as the operation of the first fault detection unit 473 described above, so the explanation of the operation of the second fault detection unit 483 is omitted.

[0151] (1) As described above, according to this embodiment, the first fault detection unit 473 in Figure 13 detects a fault based on the determination value Vx obtained from the above formula F2. Therefore, faults can be detected without requiring any structural additions. For example, high functional safety can be provided without increasing the size of the substrate 30. Furthermore, since the number of patterns required for fault detection does not increase, the pattern area per receiving coil can be easily increased, and the amplitude of the detection signal and robustness against misalignment of the rotating member 20 can be improved.

[0152] To explain the effects of this embodiment, let us consider the following first comparative example. For example, in this first comparative example, the first sensor output from the first system 305 increases as the rotation angle of the rotating member 20 increases, as shown by the dashed line L1 in Figure 15. The second sensor output from the second system 306 decreases as the rotation angle of the rotating member 20 increases, as shown by the solid line L2 in Figure 15. In short, the first sensor output and the second sensor output are set to have an inverse correlation with respect to the rotation angle of the rotating member 20.

[0153] In this first comparative example, the sum of the first sensor output and the second sensor output will be a constant value if there is no error under normal conditions. Therefore, by monitoring the sum of the first and second sensor outputs, fault detection (in other words, abnormality determination) can be performed. However, in the first comparative example, although fault detection is possible, it is not possible to determine which of the first or second sensor outputs is a normal value when a fault is detected.

[0154] In contrast, in this embodiment, it is possible to determine whether a malfunction has occurred in either the first system 305 or the second system 306. Therefore, even if a malfunction is detected in one of the first system 305 or the second system 306, the rotation angle of the rotating member 20 can still be detected by the other system, which is functioning normally.

[0155] Except as described above, this embodiment is the same as the first embodiment. In this embodiment, the effects obtained from the configuration common to the first embodiment can be obtained in the same way as in the first embodiment.

[0156] Although this embodiment is a modification based on the first embodiment, it is also possible to combine this embodiment with any of the second to fourth embodiments described above.

[0157] (Sixth Embodiment) Next, a sixth embodiment will be described. This embodiment will primarily describe the differences from the first embodiment described above.

[0158] As shown in Figures 16 to 18, in this embodiment, the rotating member 20 of the first embodiment (see Figure 1) is composed of two parts. That is, in this embodiment, the position detection device 1 includes a first target member 16 and a second target member 18 that are combined together, instead of the rotating member 20 of the first embodiment. Since the first target member 16 and the second target member 18 in this embodiment as a whole correspond to the rotating member 20 of the first embodiment, the rotation axis CL is the rotation center of the first target member 16 and the second target member 18. Furthermore, the first target member 16 and the second target member 18 are made of metal, similar to the rotating member 20 of the first embodiment.

[0159] Furthermore, the overall shape of the combined first target member 16 and second target member 18 in this embodiment is the same as that of the rotating member 20 in the first embodiment when viewed along the member axis direction Da. For example, the shape and arrangement of each target 22-25 are the same as in the first embodiment when viewed along the member axis direction Da. Figure 16 is a cross-sectional view showing the XVI-XVI section of Figure 17.

[0160] The first target member 16 has a first connecting portion 161 and two first targets 22 and 23. The second target member 18 has a second connecting portion 181 and two second targets 24 and 25. For example, the first target member 16 is configured as a single part including the first connecting portion 161 and the two first targets 22 and 23, and the second target member 18 is configured as a single part including the second connecting portion 181 and the two second targets 24 and 25.

[0161] The first connecting portion 161 and the second connecting portion 181 together correspond to the connecting portion 21 of the first embodiment. Specifically, the first connecting portion 161 is located in the central part of the first target member 16 and has an annular shape centered on the rotation axis CL. The two first targets 22 and 23 are each formed to protrude outward from the first connecting portion 161 in the radial direction Dr of the member, and are located outside the second connecting portion 181 in the radial direction Dr of the member. Inside the first connecting portion 161, a first insertion hole 161a is formed, penetrating the first connecting portion 161 in the axial direction Da of the member, and the rotation shaft 70 is inserted into the first insertion hole 161a. As a result, the first connecting portion 161 is connected to the rotation shaft 70 without the second target member 18, so that it cannot rotate relative to the rotation shaft 70.

[0162] Furthermore, the second connecting portion 181 is stacked on one side of the member axial direction Da relative to the first connecting portion 161. The second connecting portion 181 has the same shape as the first connecting portion 161 when viewed in the direction along the member axial direction Da.

[0163] In other words, the second connecting portion 181 is located in the central part of the second target member 18 and has an annular shape centered on the rotation axis CL. The two second targets 24 and 25 are each formed to protrude outward from the second connecting portion 181 in the radial direction Dr of the member, and are positioned outside the first connecting portion 161 in the radial direction Dr of the member. Inside the second connecting portion 181, a second insertion hole 181a is formed, which penetrates the second connecting portion 181 in the axial direction Da of the member.

[0164] The second insertion hole 181a is concentric and has the same diameter as the first insertion hole 161a, and is positioned to connect continuously from the first insertion hole 161a to the member axial direction Da. In short, the first insertion hole 161a and the second insertion hole 181a are aligned in series to form a single through hole. The rotating shaft 70 is also inserted into the second insertion hole 181a, just as it is into the first insertion hole 161a. As a result, the second connecting portion 181 is connected to the rotating shaft 70 without the first target member 16, so that it cannot rotate relative to the rotating shaft 70.

[0165] In detail, the rotating shaft 70 has a cylindrical shaft body 701 and two protrusions 702b and 702c. The shaft body 701 is the part of the rotating shaft 70 that is fitted inside the first insertion hole 161a and the second insertion hole 181a. One of the two protrusions 702b and 702c, the one-sided protrusion 702b, and the other-sided protrusion 702c, each protrude outward from the shaft body 701 in the radial direction Dr of the member. The one-sided protrusion 702b and the other-sided protrusion 702c each have a rectangular cross-section and extend in the axial direction Da of the member, and are arranged at a distance from each other in the circumferential direction Dc of the member. For example, these two protrusions 702b and 702c may be integrally formed with the shaft body 701, or they may be composed of key members fitted into key grooves provided in the shaft body 701.

[0166] Furthermore, in addition to the first insertion hole 161a described above, the first connecting portion 161 has two first insertion grooves 161b and 161c connected to the first insertion hole 161a. One of the two first insertion grooves 161b and 161c is referred to as the first first insertion groove 161b, and the other of the two first insertion grooves 161b and 161c is referred to as the first other insertion groove 161c. When viewed in the direction along the member axis direction Da, these two first insertion grooves 161b and 161c are each formed as grooves that are recessed outward from the first insertion hole 161a in the member radial direction Dr, and are arranged with a gap between them in the member circumferential direction Dc.

[0167] Similarly, in addition to the second insertion hole 181a described above, the second connecting portion 181 has two second insertion grooves 181b and 181c connected to the second insertion hole 181a. One of the two second insertion grooves 181b and 181c is referred to as the second first insertion groove 181b, and the other of the two second insertion grooves 181b and 181c is referred to as the second other insertion groove 181c. When viewed in the direction along the member axis direction Da, these two second insertion grooves 181b and 181c are each formed as grooves that are recessed outward from the second insertion hole 181a in the member radial direction Dr, and are arranged with a gap between them in the member circumferential direction Dc.

[0168] Furthermore, when viewed in the direction along the member axis direction Da, the second one-way insertion groove 181b has the same shape and arrangement as the first one-way insertion groove 161b, and the second other-way insertion groove 181c has the same shape and arrangement as the first other-way insertion groove 161c. In short, the first one-way insertion groove 161b and the second one-way insertion groove 181b are arranged in series so as to connect continuously to the member axis direction Da, forming a single groove that extends in the member axis direction Da. Similarly, the first other-way insertion groove 161c and the second other-way insertion groove 181c are also arranged in series so as to connect continuously to the member axis direction Da, forming a single groove that extends in the member axis direction Da.

[0169] Then, the protruding portion 702b on one side of the rotating shaft 70 is fitted into the first one-way fitting groove 161b and the second one-way fitting groove 181b, and the protruding portion 702c on the other side of the rotating shaft 70 is fitted into the first other-way fitting groove 161c and the second other-way fitting groove 181c.

[0170] In the first target member 16, the opposing surface 22a of the first one-sided target 22 and the opposing surface 23a of the first other-sided target 23 are each positioned on one side of the first connecting portion 161 in the member axial direction Da. Therefore, a step in the member axial direction Da is formed between the opposing surface 22a of the first one-sided target 22 and the first connecting portion 161, and a step in the member axial direction Da is also formed between the opposing surface 23a of the first other-sided target 23 and the first connecting portion 161.

[0171] As a result, in this embodiment as in the first embodiment, the axial distance AG between the substrate 30 and each of the opposing surfaces 22a, 23a, 24a, and 25a of the four targets 22 to 25 is aligned with each other. In other words, the axial distance AG is the same in all cases between the substrate 30 and each of the opposing surfaces 22a, 23a, 24a, and 25a of the four targets 22 to 25.

[0172] Furthermore, in this embodiment as in the first embodiment, the thickness of the four targets 22 to 25 in the member axial direction Da is the same size.

[0173] (1) As described above, according to this embodiment, the first target member 16, which includes two first targets 22 and 23, is connected without the second target member 18 so as to be unable to rotate relative to the rotation axis 70. The second target member 18, which includes two second targets 24 and 25, is connected without the first target member 16 so as to be unable to rotate relative to the rotation axis 70.

[0174] Therefore, compared to, for example, a case where four targets 22-25 are contained in a single component, the impact of a failure in one of the first targets 22, 23 and the second targets 24, 25 on the other can be reduced or prevented. This makes it possible to increase the redundancy of the position detection device 1.

[0175] For example, a failure of the first and second target members 16 and 18 could be such that wear causes the target position to shift by several degrees from its normal position, or the axial distance AG between the target and the substrate 30 to change from its normal position. Even if such a failure occurs in one of the first or second target members 16 or 18, that failure is unlikely to affect the other target member, and the rotational position of the rotation axis 70 can still be detected by the other target member.

[0176] Furthermore, in addition to the wear described above, a failure of one of the first and second target members 16 and 18 could also be a slight deformation or slight displacement in the circumferential direction Dc of that target member. In such cases, the failure would have little effect on the other target member, and the rotational position of the rotation axis 70 could still be detected by the other target member.

[0177] (2) In addition, according to this embodiment, the first insertion hole 161a and the second insertion hole 181a are arranged to connect with each other in the member axial direction Da. The first one insertion groove 161b and the second one insertion groove 181b are also arranged to connect with each other in the member axial direction Da, and the first other insertion groove 161c and the second other insertion groove 181c are also arranged to connect with each other in the member axial direction Da. The one-sided projection 702b of the rotating shaft 70 is fitted into the first one insertion groove 161b and the second one insertion groove 181b, and the other-sided projection 702c of the rotating shaft 70 is fitted into the first other insertion groove 161c and the second other insertion groove 181c.

[0178] Therefore, the first target member 16 is connected to the rotation axis 70 without the second target member 18 so that it cannot rotate relative to the rotation axis 70, and the second target member 18 is connected to the rotation axis 70 without the first target member 16 so that it cannot rotate relative to the rotation axis 70. Furthermore, this configuration in which the first and second target members 16 and 18 are connected to the rotation axis 70 can be realized with a simple structure.

[0179] (3) Furthermore, according to this embodiment, the opposing surfaces 22a and 23a of the two first targets 22 and 23 are each positioned on one side of the member axial direction Da relative to the first connecting portion 161. As a result, the axial distance AG between the substrate 30 and the opposing surfaces 22a and 23a of the first targets 22 and 23, and the axial distance AG between the substrate 30 and the opposing surfaces 24a and 25a of the second targets 24 and 25 are aligned with each other. Therefore, the first target member 16 and the second target member 18 can be combined and attached to the rotating shaft 70, and the output of each receiving coil 34-37 and 40-43 can be made to be of roughly the same magnitude.

[0180] Except as described above, this embodiment is the same as the first embodiment. In this embodiment, the effects obtained from the configuration common to the first embodiment can be obtained in the same way as in the first embodiment.

[0181] Although this embodiment is a modification based on the first embodiment, it is also possible to combine this embodiment with any of the second to fifth embodiments described above.

[0182] (Seventh Embodiment) Next, a seventh embodiment will be described.

[0183] The angular position sensor described in Patent Document 1 uses electromagnetic induction to detect the rotational position of a rotating member, which is the object to be detected, as it rotates around its axis of rotation. Specifically, the angular position sensor of Patent Document 1 comprises a pair of transmitting coils that generate an alternating magnetic field and a pair of receiving coil groups.

[0184] Each of the pair of receiving coil groups contains multiple receiving coils, with one receiving coil group of the pair positioned on the opposite side of the rotation axis from the other receiving coil group. One of the pair of transmitting coils surrounds the first receiving coil group, and the other transmitting coil surrounds the other receiving coil group.

[0185] In this case, with a position detection device such as the angular position sensor described in Patent Document 1, there is a concern that the rotating member may be misaligned with the substrate having a transmitting coil and a receiving coil.

[0186] However, the angular position sensor described in Patent Document 1 does not take any measures to address misalignment of the rotating member with respect to the substrate. As a result, the misalignment of the rotating member has a significant impact on the output of the angular position sensor, which represents the rotational position of the rotating member. For example, this misalignment of the rotating member can lead to a decrease in the detection accuracy of the rotational position of the rotating member.

[0187] In contrast, this embodiment makes it possible to easily obtain a configuration that can reduce the influence of misalignment of the rotating member on the output of the position detection device that represents the rotational position of the rotating member, in short, a configuration that is resistant to misalignment of the rotating member.

[0188] Specifically, this embodiment is the same as the first embodiment. Therefore, in this embodiment, the effects achieved from the configuration common to the first embodiment can be obtained in the same way as in the first embodiment.

[0189] (Summary of the 7th embodiment) The seventh embodiment is configured as described above. Therefore, in summary, the seventh embodiment can be said to possess the following features.

[0190] [Perspective 1] A position detection device, A rotating member (16, 18, 20) having a first one-sided target (22), a first other-sided target (23), a second one-sided target (24), and a second other-sided target (25), which rotates about a predetermined axis of rotation (CL), First transmitting coils (31, 311, 312), second transmitting coils (32, 321, 322), first receiving coils (34) and second receiving coils (35) which constitute the first receiving coil group (301a) due to electromagnetic induction by energizing the first transmitting coils, generating an induced electromotive force corresponding to the position of the first one-sided target, first other receiving coils (36) and second other receiving coils (37) which constitute the first other receiving coil group (302a) due to electromagnetic induction by energizing the first transmitting coils, generating an induced electromotive force corresponding to the position of the first other-sided target, second receiving coil group (3 03a) comprises a third one-sided receiving coil (40) and a fourth one-sided receiving coil (41), and a third other-sided receiving coil (42) and a fourth other-sided receiving coil (43) which constitute a second other-sided receiving coil group (304a) due to electromagnetic induction by energizing the second transmitting coil, which generates an induced electromotive force corresponding to the position of the second other-sided target, and a substrate (30) which is positioned facing the first one-sided target, the first other-sided target, the second one-sided target, and the second other-sided target, with the axial direction (Da) of the rotation axis normal to the substrate, and positioned on one side in the axial direction with respect to the first one-sided target, the first other-sided target, the second one-sided target, and the second other-sided target. The first receiving coil and the first receiving coil are connected in series in a direction that reinforces each other's induced electromotive forces. The second receiving coil on one side and the second receiving coil on the other side are connected in series in a direction that reinforces each other's induced electromotive force. The third receiving coil on one side and the third receiving coil on the other side are connected in series in a direction that reinforces each other's induced electromotive forces. The fourth one-sided receiving coil and the fourth other-sided receiving coil are connected in series in a direction that reinforces each other's induced electromotive forces. The first one-sided target is positioned on the opposite side of the first other-sided target, with the rotation axis in between. The second one-sided target is positioned on the opposite side of the second other-sided target, with the rotation axis in between. The first one-sided receiving coil group is arranged on the opposite side of the first other-sided receiving coil group, with the rotation axis in between. A position detection device in which the second one-sided receiving coil group is arranged on the opposite side of the rotation axis from the second other-sided receiving coil group.

[0191] In this way, the effect of the rotational member's misalignment on the coil output of each receiving coil, as described above, is canceled out between the receiving coils connected in series. Therefore, a configuration that is resistant to the misalignment of the rotating member can be easily obtained.

[0192] [Perspective 2] The position detection device according to viewpoint 1, wherein, in a view along the axial direction, the first one-sided receiving coil, the first other-sided receiving coil, the second one-sided receiving coil, the second other-sided receiving coil, the third one-sided receiving coil, the third other-sided receiving coil, the fourth one-sided receiving coil, and the fourth other-sided receiving coil are arranged inside the first transmitting coil and inside the second transmitting coil.

[0193] [Perspective 3] Two of the first transmitting coils are provided, and the two first transmitting coils include a first one-side transmitting coil (311) and a first other-side transmitting coil (312). Two second transmitting coils are also provided, and these two second transmitting coils include a second one-side transmitting coil (321) and a second other-side transmitting coil (322). In a view along the axial direction, the first one-sided receiving coil and the second one-sided receiving coil are arranged inside the first one-sided transmitting coil, while they are arranged outside the first other-sided transmitting coil, outside the second one-sided transmitting coil, and outside the second other-sided transmitting coil. In a view along the axial direction, the first other receiving coil and the second other receiving coil are arranged inside the first other transmitting coil, while the other receiving coil is arranged outside the first one transmitting coil, outside the second one transmitting coil, and outside the second other transmitting coil. In a view along the axial direction, the third one-sided receiving coil and the fourth one-sided receiving coil are arranged inside the second one-sided transmitting coil, while the first one-sided transmitting coil, the first other-sided transmitting coil, and the second other-sided transmitting coil are arranged outside the first one-sided transmitting coil, The position detection device according to viewpoint 1, wherein, in a view along the axial direction, the third other receiving coil and the fourth other receiving coil are arranged inside the second other transmitting coil, while they are arranged outside the first one transmitting coil, outside the first other transmitting coil, and outside the second one transmitting coil.

[0194] [Perspective 4] The position detection device according to any one of viewpoints 1 to 3, wherein each of the first one-sided receiving coil, the first other-sided receiving coil, the second one-sided receiving coil, the second other-sided receiving coil, the third one-sided receiving coil, the third other-sided receiving coil, the fourth one-sided receiving coil, and the fourth other-sided receiving coil each have a plurality of spiral portions (34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b) that form a spiral pattern shape when viewed in the direction along the axial direction.

[0195] [Perspective 5] The position detection device according to any one of viewpoints 1 to 3, wherein each of the first one-sided receiving coil, the first other-sided receiving coil, the second one-sided receiving coil, the second other-sided receiving coil, the third one-sided receiving coil, the third other-sided receiving coil, the fourth one-sided receiving coil, and the fourth other-sided receiving coil each have a plurality of wavy portions (34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e) that form a pattern shape drawing a sinusoidal curve when viewed in the direction along the axial direction.

[0196] (Other embodiments) (1) In each of the embodiments described above, the position detection device 1 is used, for example, to detect the rotational position of a brake pedal or accelerator pedal for a vehicle, but the use of the position detection device 1 is not limited to this and can be envisioned in various ways. Furthermore, the position detection device 1 may be used for purposes other than those for vehicles.

[0197] (2) In each of the embodiments described above, for example as shown in Figure 1, the direction of movement of targets 22 to 25 is the circumferential direction Dc of the member, but this is just one example. For example, targets 22 to 25 may move back and forth in a linear manner, and the position detection device 1 may detect the position of targets 22 to 25 in the direction of movement.

[0198] (3) In each of the embodiments described above, as shown in Figure 1, all four targets 22 to 25 have the same sector shape, but this is just one example. The shapes of targets 22 to 25 do not have to be sector shapes, and the shapes of targets 22 to 25 may be different from each other.

[0199] (4) In each of the embodiments described above, for example as shown in Figure 1, the rotating member 20 has two first targets 22 and 23, but it is also conceivable that it has one of the two first targets 22 and 23 and not the other. Similarly, it is also conceivable that the rotating member 20 has one of the two second targets 24 and 25 and not the other. Furthermore, there may be three or more first targets 22 and 23, and there may also be three or more second targets 24 and 25.

[0200] (5) In each of the embodiments described above, as shown in Figure 8, the position detection device 1 includes a first system 305 and a second system 306 which are configured independently as electrical circuits, but it is also acceptable to have three or more systems which are configured independently as electrical circuits.

[0201] (6) In each of the embodiments described above, for example as shown in Figure 5, the first one-sided receiving coil group 301a is arranged on the opposite side of the rotation axis CL from the first other-sided receiving coil group 302a. The first system 305 (see Figure 8) has a pair of receiving coil groups 301a and 302a arranged on both sides of the rotation axis CL in this manner. However, this is just one example, and it is acceptable to have two or more pairs of receiving coil groups arranged on both sides of the rotation axis CL in this manner. The same applies to the second system 306.

[0202] (7) In each of the embodiments described above, the first system 305 includes a first one-sided receiving coil group 301a and a first other-sided receiving coil group 302a, but this is just an example. For example, the first system 305 may include only one of the receiving coil groups, the first one-sided receiving coil group 301a and the first other-sided receiving coil group 302a, and may not include the other receiving coil group. In this case as well, the waveform of the detection signal output by the first receiving coil belonging to that one receiving coil group will be a sinusoidal wave similar to the waveform of the first voltage value V1 in Figure 9. The waveform of the detection signal output by the second receiving coil belonging to that one receiving coil group will be a cosine wave similar to the waveform of the second voltage value V2 in Figure 9. Therefore, for example, fault detection using the control process in Figure 14 can be performed in the same manner as in the fifth embodiment described above. The same applies to the second system 306.

[0203] (8) In the sixth embodiment described above, as shown in Figure 16, the one-sided projection 702b and the other-sided projection 702c each have a rectangular cross-section and extend in the member axis direction Da, but their cross-sectional shapes are not limited to a rectangular cross-section. For example, the cross-sectional shapes of the one-sided projection 702b and the other-sided projection 702c can be various shapes such as trapezoidal, polygonal, or semicircular.

[0204] (9) In each of the embodiments described above, alternating currents of the same frequency, for example, flow through the first transmitting coil 31 and the second transmitting coil 32, but this is not limited to this. For example, the currents do not need to be of the same frequency, as long as the direction of current flow in the first transmitting coil 31 and the second transmitting coil 32 is not opposite at the same timing.

[0205] (10) In the fifth embodiment described above, the processing of each step shown in the flowchart of Figure 14 is implemented by a computer program, but it may also be implemented by hardware.

[0206] (11) The present invention is not limited to the embodiments described above and can be implemented in various modified forms. Furthermore, the embodiments described above are not unrelated to each other and can be combined as appropriate, except in cases where the combination is clearly impossible.

[0207] Furthermore, it goes without saying that, in each of the above embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated to be particularly essential or unless they are clearly considered essential in principle. Also, in each of the above embodiments, when numerical values ​​such as the number, numerical values, quantities, or ranges of the components of the embodiment are mentioned, the embodiment is not limited to those specific numbers unless explicitly stated to be particularly essential or unless it is clearly limited to a specific number in principle. Also, in each of the above embodiments, when the material, shape, positional relationship, etc. of the components are mentioned, the embodiment is not limited to those material, shape, positional relationship, etc. unless explicitly stated or unless it is clearly limited to a specific material, shape, positional relationship, etc. in principle.

[0208] Furthermore, the signal processing units 47, 48 and their methods described in this disclosure may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the signal processing units 47, 48 and their methods described in this disclosure may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the signal processing units 47, 48 and their methods described in this disclosure may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. The computer program may also be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium.

[0209] (Features of the present invention) [ Features 1] A position detection device, A first target (22, 23) moves back and forth in a predetermined direction of movement (Dc), A second target (24, 25) moves back and forth in the direction of movement together with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) through which an induced current flows due to electromagnetic induction caused by energizing the first transmitting coil and outputs detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) through which an induced current flows due to electromagnetic induction caused by energizing the second transmitting coil and outputs detection signals corresponding to the position of the second target, and a substrate (30) facing the first target and the second target, with the direction intersecting the direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target. The first receiving region (301, 302) occupied by the first receiving coil and the second receiving coil within the substrate, and the second receiving region (303, 304) occupied by the third receiving coil and the fourth receiving coil within the substrate are arranged side by side in the direction of movement. The first target is a position detection device that moves back and forth within an operating range (W1a, W1b) in which the first target does not overlap with the other side opposite to the one side in the normal direction relative to the second receiving area. [ Features 2] The operating range of the first target is a range distributed in the direction of movement, centered on the central position (301b, 302b) of the first receiving area in the direction of movement. Features The position detection device described in 1. [ Features 3] The first target moves back and forth without extending beyond the range of the other side of one end position (P1) of the first receiving area and the one side of the other end position (P2) of the first receiving area in the direction of movement. Features A position detection device as described in 1 or 2. [ Features 4] In a view along the normal direction of the substrate, the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil are arranged inside the first transmitting coil and inside the second transmitting coil. Features A position detection device as described in any one of 1 to 3. [ Features 5] In a view along the normal direction of the substrate, the first receiving coil and the second receiving coil are positioned inside the first transmitting coil and outside the second transmitting coil, and the third receiving coil and the fourth receiving coil are positioned inside the second transmitting coil and outside the first transmitting coil. Features A position detection device as described in any one of 1 to 3. [ Features 6] The first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of spiral-shaped portions (34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b) that form a spiral pattern shape when viewed in a direction along the normal direction of the substrate. Features A position detection device as described in any one of 1 to 5. [ Features 7] The first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of wavy portions (34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e) that form a pattern shape that draws a sinusoidal curve when viewed in the direction along the normal direction of the substrate. Features A position detection device as described in any one of 1 to 5. [ Features 8] When the magnitude of the detection signal output by the first receiving coil is V1 and the magnitude of the detection signal output by the second receiving coil is V2, then "V1 2 +V2 2 It is equipped with fault detection units (473, 483) that detect faults based on the value (Vx) obtained from ", The detection signal of the first receiving coil changes sinusoidally with respect to the electrical angle (θ) corresponding to the position of the first target. The detection signal of the second receiving coil changes in a cosine wave manner with respect to the electrical angle. Features A position detection device as described in any one of 1 to 7. [ Features 9] The first target and the second target each constitute a part of a rotating member (16, 18, 20) that rotates about an axis (CL) with the normal direction as the axial direction, The aforementioned direction of movement is the circumferential direction (Dc) of the axis. Features A position detection device as described in any one of 1 to 8. [ Features 10] Two of the first targets are provided, and one of the two first targets (22) is positioned on the opposite side of the axis from the other first target (23). Two receiving coil groups (301a, 302a) are also provided, each consisting of a first receiving coil and a second receiving coil. One of these two receiving coil groups (301a) is positioned on the opposite side of the axis from the other receiving coil group (302a). Features The position detection device described in 9. [ Features 11] The first receiving coil (34) belonging to one of the receiving coil groups and the first receiving coil (36) belonging to the other receiving coil group are electrically connected. The second receiving coil (35) belonging to one of the receiving coil groups and the second receiving coil (37) belonging to the other receiving coil group are also electrically connected. Features The position detection device described in 10. [ Features 12] The first receiving coil (34) belonging to one of the receiving coil groups and the first receiving coil (36) belonging to the other receiving coil group are connected in series in a direction that reinforces the induced electromotive forces generated by the electromagnetic induction of the first transmitting coil. The second receiving coil (35) belonging to one of the receiving coil groups and the second receiving coil (37) belonging to the other receiving coil group are connected in series in a direction that reinforces the induced electromotive forces generated by the electromagnetic induction of the first transmitting coil. Features The position detection device described in 10. [ Features 13] The first target member (16) including the first target, The device comprises a second target member (18) including the second target, The first target member is connected to the object to be detected (70) without the second target member so that it cannot be displaced relative to it in the direction of movement. The second target member is connected to the object to be detected without the first target member, such that it cannot be displaced relative to the object in the direction of movement. Features A position detection device as described in any one of 1 to 12. [ Features 14] A first insertion hole (161a) into which a detected object (70) that rotates about an axis (CL) with the normal direction as the axial direction is inserted, and first insertion grooves (161b, 161c) connected to the first insertion hole are formed, and a first target member (16) including the first target, A second target member (18) is provided, which includes a second insertion hole (181a) into which the object to be detected is inserted, and second insertion grooves (181b, 181c) connected to the second insertion hole, and the second target member (18) includes the second target. The aforementioned direction of movement is the circumferential direction (Dc) of the axis, The first insertion hole and the second insertion hole are arranged so as to be connected to each other in the axial direction. The first and second insertion grooves are also arranged so as to be connected to each other in the axial direction. The first and second insertion grooves are fitted with protrusions (702b, 702c) that are provided on the object to be detected and protrude outward in the radial direction (Dr) of the axis. Features A position detection device as described in any one of 1 to 8. [ Features 15] The first target has opposing surfaces (22a, 23a) formed on one side in the normal direction and facing the substrate, The second target also has opposing surfaces (24a, 25a) formed on one side in the normal direction and facing the substrate, The first target member has a first connecting portion (161) that connects to the object to be detected, The second target member has a second connecting portion (181) which is arranged on one side in the normal direction to the first connecting portion and connected to the object to be detected, The opposing surface of the first target is provided on one side in the normal direction relative to the first connecting portion, so that the distance (AG) between the opposing surface of the first target and the substrate and the distance (AG) between the opposing surface of the second target and the substrate are aligned in the normal direction. Features A position detection device as described in 13 or 14. [Explanation of Symbols]

[0210] 22 First one-sided target (first target) 23. First other-side target (first target) 24. Second one-sided target (second target) 25. Second other-side target (second target) 31, 311, 312 First transmitting coil 32, 321, 322 Second transmitting coil 34, 36 First receiving coil 35, 37 Second receiving coil 40, 42 Third receiving coil 41, 43 Fourth receiving coil

Claims

1. A position detection device, A first target (22, 23) moves back and forth in a predetermined direction of movement (Dc), A second target (24, 25) moves back and forth in the direction of movement together with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) through which an induced current flows due to electromagnetic induction caused by energizing the first transmitting coil and outputs detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) through which an induced current flows due to electromagnetic induction caused by energizing the second transmitting coil and outputs detection signals corresponding to the position of the second target, and a substrate (30) facing the first target and the second target, with the direction intersecting the direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target, The first receiving region (301, 302) occupied by the first receiving coil and the second receiving coil within the substrate, and the second receiving region (303, 304) occupied by the third receiving coil and the fourth receiving coil within the substrate are arranged side by side in the direction of movement. The first target moves back and forth within an operating range (W1a, W1b) such that the first target does not overlap with the other side opposite to the one side in the normal direction relative to the second receiving area. The first target and the second target each constitute a part of a rotating member (16, 18, 20) that rotates about an axis (CL) with the normal direction as the axial direction, The aforementioned direction of movement is the circumferential direction (Dc) of the axis, Two of the first targets are provided, and one of the two first targets (22) is positioned on the opposite side of the axis from the other first target (23). A position detection device is also provided, which includes two receiving coil groups (301a, 302a) configured as a combination of the first receiving coil and the second receiving coil, wherein one of the two receiving coil groups (301a) is positioned on the opposite side of the axis from the other receiving coil group (302a).

2. The first receiving coil (34) belonging to one of the receiving coil groups and the first receiving coil (36) belonging to the other receiving coil group are electrically connected. The position detection device according to claim 1, wherein the second receiving coil (35) belonging to one of the receiving coil groups and the second receiving coil (37) belonging to the other receiving coil group are also electrically connected.

3. The first receiving coil (34) belonging to one of the receiving coil groups and the first receiving coil (36) belonging to the other receiving coil group are connected in series in a direction that reinforces the induced electromotive forces generated by the electromagnetic induction of the first transmitting coil. The position detection device according to claim 1, wherein the second receiving coil (35) belonging to one of the receiving coil groups and the second receiving coil (37) belonging to the other receiving coil group are connected in series in a direction that reinforces the induced electromotive forces of each other generated by the electromagnetic induction of the first transmitting coil.

4. A position detection device, A first target member (16) includes a first target (22, 23) that moves back and forth in a predetermined direction of movement (Dc), A second target member (18) includes a second target (24, 25) that moves back and forth in the direction of movement together with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) through which an induced current flows due to electromagnetic induction caused by energizing the first transmitting coil and outputs detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) through which an induced current flows due to electromagnetic induction caused by energizing the second transmitting coil and outputs detection signals corresponding to the position of the second target, and a substrate (30) facing the first target and the second target, with the direction intersecting the direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target, The first receiving region (301, 302) occupied by the first receiving coil and the second receiving coil within the substrate, and the second receiving region (303, 304) occupied by the third receiving coil and the fourth receiving coil within the substrate are arranged side by side in the direction of movement. The first target moves back and forth within an operating range (W1a, W1b) such that the first target does not overlap with the other side opposite to the one side in the normal direction relative to the second receiving area. The first target member is connected to the object to be detected (70) without the second target member so that it cannot be displaced relative to the object in the direction of movement. A position detection device in which the second target member is connected to the object to be detected without the first target member, such that it cannot be displaced relative to the object in the direction of movement.

5. A position detection device, A first target (22, 23) moves back and forth in a predetermined direction of movement (Dc), A second target (24, 25) moves back and forth in the direction of movement together with the first target, The device comprises a first transmitting coil (31, 311, 312), a second transmitting coil (32, 321, 322), first receiving coils (34, 36) and second receiving coils (35, 37) through which an induced current flows due to electromagnetic induction caused by energizing the first transmitting coil and outputs detection signals (V1, V2) corresponding to the position of the first target, and a third receiving coil (40, 42) and fourth receiving coil (41, 43) through which an induced current flows due to electromagnetic induction caused by energizing the second transmitting coil and outputs detection signals corresponding to the position of the second target, and a substrate (30) facing the first target and the second target, with the direction intersecting the direction of movement being the normal direction (Da), and positioned on one side of the normal direction with respect to the first target and the second target, The first receiving region (301, 302) occupied by the first receiving coil and the second receiving coil within the substrate, and the second receiving region (303, 304) occupied by the third receiving coil and the fourth receiving coil within the substrate are arranged side by side in the direction of movement. The first target moves back and forth within an operating range (W1a, W1b) such that the first target does not overlap with the other side opposite to the one side in the normal direction relative to the second receiving area. Furthermore, the position detection device is A first insertion hole (161a) into which a detected object (70) that rotates about an axis (CL) with the normal direction as the axial direction is inserted, and first insertion grooves (161b, 161c) connected to the first insertion hole are formed, and a first target member (16) including the first target, The second target member (18) includes a second insertion hole (181a) into which the object to be detected is inserted, and second insertion grooves (181b, 181c) connected to the second insertion hole, and the second target member (18) includes the second target. The aforementioned direction of movement is the circumferential direction (Dc) of the axis, The first insertion hole and the second insertion hole are arranged so as to be connected to each other in the axial direction. The first and second insertion grooves are also arranged so as to be connected to each other in the axial direction. A position detection device in which protrusions (702b, 702c) provided on the object to be detected and extending outward in the radial direction (Dr) of the axis are fitted into the first and second fitting grooves.

6. The first target has opposing surfaces (22a, 23a) formed on one side in the normal direction and facing the substrate, The second target also has opposing surfaces (24a, 25a) formed on one side in the normal direction and facing the substrate, The first target member has a first connecting portion (161) that connects to the object to be detected, The second target member has a second connecting portion (181) which is arranged on one side in the normal direction to the first connecting portion and connected to the object to be detected, The position detection device according to claim 4 or 5, wherein the opposing surface of the first target is provided on one side in the normal direction of the first connecting portion, so that the distance (AG) between the opposing surface of the first target and the substrate and the distance (AG) between the opposing surface of the second target and the substrate in the normal direction are aligned with each other.

7. The position detection device according to any one of claims 1 to 5, wherein the operating range of the first target is a range distributed in the direction of movement with respect to the central position (301b, 302b) of the first receiving area in the direction of movement.

8. The position detection device according to any one of claims 1 to 5, wherein the first target moves back and forth without extending beyond the range on the other side of one end position (P1) of the first receiving area and on the one side of the other end position (P2) of the first receiving area in the direction of movement.

9. The position detection device according to any one of claims 1 to 5, wherein, in a view along the normal direction of the substrate, the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil are arranged inside the first transmitting coil and inside the second transmitting coil.

10. The position detection device according to any one of claims 1 to 5, wherein, in a view along the normal direction of the substrate, the first receiving coil and the second receiving coil are arranged inside the first transmitting coil and outside the second transmitting coil, and the third receiving coil and the fourth receiving coil are arranged inside the second transmitting coil and outside the first transmitting coil.

11. The position detection device according to any one of claims 1 to 5, wherein the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of spiral portions (34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b, 40a, 40b, 41a, 41b, 42a, 42b, 43a, 43b) that form a spiral pattern shape when viewed in a direction along the normal direction of the substrate.

12. The position detection device according to any one of claims 1 to 5, wherein the first receiving coil, the second receiving coil, the third receiving coil, and the fourth receiving coil each have a plurality of wavy portions (34d, 34e, 35d, 35e, 36d, 36e, 37d, 37e, 40d, 40e, 41d, 41e, 42d, 42e, 43d, 43e) that form a pattern shape that draws a sinusoidal curve when viewed in the direction along the normal direction of the substrate.

13. When the magnitude of the detection signal output by the first receiving coil is V1 and the magnitude of the detection signal output by the second receiving coil is V2, then "V1 2 +V2 2 The system includes fault detection units (473, 483) that detect faults based on a value (Vx) obtained from the above, The detection signal of the first receiving coil changes sinusoidally with respect to the electrical angle (θ) corresponding to the position of the first target, The position detection device according to any one of claims 1 to 5, wherein the detection signal of the second receiving coil changes in a cosine wave manner with respect to the electrical angle.

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